The Fall of the Roman Empire is a lurid statement, and simply false, as some
  knowledgeable fellow travelers in our group pointed out on our way to the  Trier exhibitions.
  
    
      
         
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        Synopsis of the decline and change of the western part of the Roman
        Empire Click to enlarge. 
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In fact, as seen in the synoptic representation, several reasons contributed to the slow disintegration, decline, and change of the Roman Empire.
Red Baron will not describe
  the three Trier exhibitions
  separately but will give his overall view that may not coincide with some expert
  opinion.
  At the end of the third century, it became clear to Emperor
  Diocletian
  that the vast Empire comprising the Mediterranean, extending from Britannia to
  the Persian border and crumbling at its edges, could no longer be governed from
  central Rome. The Empire needed a more efficient administrative structure and a
  clear succession plan. 
  Residing on the Dalmatian coast in Spalatum (today Split), Diocletian
  elevated
  Maximian
  to co-emperor in 285, entrusting him with the administration of the western
  half of the Empire.
   The Roman Tetrarchy, a reign of four emperors, was born when in 293,
  Diocletian and Maximian, in their position as Augusti, appointed
  Constantius
  and
  Galerius
  as junior emperors (Caesares) and presumptive successors.
  Here are the four of the first Roman tetrarchy. They are replicas of the
  porphyry statues from 1204, now in St. Mark's, Venice.
  
    
      
         
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         Augustus Diocletian embraces Caesar Galerius.
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         Augustus Maximian embraces Caesar Constantius. | 
    
  
The installation of the first Roman tetrarchy and the division of power was as follows:
  A Diocletian (284-305) Orient
C Galerius (293-305) The
  Danubian provinces from Noricum to the mouth of the Danube
  A Maximian (285-305) Occident with Italy, Spain, and Africa
C
  Constantius (293-305) Gaul and Britannia
  
    
      
         
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        Constantine's second Wife, Empress
        Fausta, with nimbus and precious jewelry. A secco painting on plaster
        from the Constantine Basilica in Trier before 330. 
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Constantius took up his seat of government in 
Augusta Treverorum (Trier).
When he died as early as 306, the army in Britain acclaimed his son Constantine
as emperor. 
Constantine's rise on the shield set a precedent for Maximian's son
  
Maxentius
  only a few months later. During riots in Rome, his troops offered him the
  title of Caesar in Italy.
  
    
      
        
          
             
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            Constantine's mother,
            St. Helena, with the holy cross found in Jerusalem.  Sandstone with
            remains of setting around 1680.
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    Maxentius, however, was regarded as a usurper by his three fellow emperors.
    Constantine marched to Rome and, under "in this sign thou shalt conquer*," defeated Maxentius at the Milvian Bridge in 313. 
 *In hoc signo vinces. The character of the cross appeared to
      him before the decisive battle.
  
  
    
  
  
    
      
        
          
            
               
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              Constantine's head in bronze from the 3rd century.  Replica
              with gilding.
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    So Constantine took it all in the west. Subsequently, he, with Augustus
    
Licinius in the east, issued the Edict of Milan that
    
everyone has the freedom to choose a deity according to his will and worship it. We have decreed this so that it may not appear that any cult
      or religion is being subjugated by us.
  
 
  This officially ended the persecution of Christians in the Occident.
  
    
      
        
           
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          Replica of the decoration of a sarcophagus from the 4th century with
          biblical motifs:  Adam and Eve, the Good Shepherd, and the
          Three Youths in the Furnace of Fire.
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  Constantine's goal was to cement the disintegrating Empire with a unified
  religious worldview taking the Christians to the task. According to
  Constantine's conception, the state and Church should be one. So Church
  representatives soon took over state tasks, such as jurisdiction. In return,
  Constantine freed the priests from state burdens such as taxes. As expected,
  unscrupulous, power-hungry men soon forced their way into the ecclesiastical
  offices.
 
  
    
      
        
          
             
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            A panel made of ivory from the 5th to the 6th century with the
            representation  of a procession of relics, i.e., showing the
            transfer of a relic to a new church building.
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  Later, the great teacher of the Church,
  
Jerome
  (347-420), commented resignedly on the religious development, "The more the
  Church gains power, the more it loses Christian virtues." He consequently
  withdrew to the Holy Land and led a monastery in Bethlehem.
  
     The power in the hands of the princes of the Church did not agree with
    the smoldering disputes about faith, whereby the most crucial question: Is
    Jesus equal to God (homousios) or only similar to God
    (homoiusios), was fought out among patriarchs and bishops with
    hard sticks.
  
  
     For Emperor Constantine, these were just idle squabbles about
    inscrutable things. He was not interested in or understanding dogmatic and
    Christological problems, especially when they endangered imperial unity.
    Again and again, the emperor admonished that his goal was, above all, that a
    single faith, pure love, and piety be preserved among the happy people of
    the Catholic Church.
  
  
    
      
        
           
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          Baroque emperor Constantine.  Sandstone with remains of a frame
          around 1680.
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  Finally, in 325, the pagan emperor summoned a council to his summer residence
  in Nicaea. To avoid disputes in the run-up to the negotiations, the unbaptized
  Constantine presided over the assembly of 318 bishops (after the 318 servants
  of Abraham). At the council, the Roman chief shepherd
  
Pope Silvester
  was represented by only two presbyters.
  
     The result of the negotiations is the sentence in the Creed, known to
    all of us, that
    the Son is true God from true God, begotten, not created, of one being
      with the Father.
  
  
     This decision was not further explained or justified because the pagan
    emperor forbade any theological discussion. With the acceptance of the
    formula of faith, for Constantine, the dispute was over because
    what pleased 318 bishops is nothing other than the will of God.
  
  
     The official declaration of the 318 bishops reads, "The holy apostolic
    and catholic church curses those who say that there was a time when the Son
    of God was not, that he was not before he was generated, that he was made or
    created from nothing or a substance or essence, that he was changeable and
    mutable."
  
  
    With this statement, the ancient Church lost its innocence when it not only
    cursed the Arians but began their bloody persecution. Not a good sign of unity.
  
  
    
      
        
           
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          Tombstone from the 5th century with a Christ monogram for
          Batimodus,  who was taken in peace at 50.
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          They gave wood shavings and snail purple into the grave. | 
      
    
  
  
  
  In the 19th century, not only historians but the bourgeoisie situated the decline of the Empire in
  the decadency of Roman life. In 1883
  
John William Waterhouse
  painted
  
Augustus Honorius
  occupying himself instead with the well-being of his guinea fowls than with
  ruling. Who does not think of
  
Friedrich Dürrenmatt's hilarious play
  
Romulus the Great, where hens lay eggs on stage?
 
  
    
      
         
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      |          Wars (orange) and civil wars (black) in the Roman Empire between 346 and 476 | 
    
  
Other reasons for the decline of the Roman Empire were defensive battles against
infiltrating barbarians and civil wars.
  
    
      
        
           
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          Around 470: infiltration of the Roman Empire or immigration?
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  Finally, the Germanic migrations are said to have overrun the Empire.
 
  
    
      
         
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      | A Frankish gravestone or the lost art of writing in the 7th century | 
    
  
In the following centuries, knowledge and technology (Roman baths)
    disappeared in Europe. Successive generations even forgot how to
    write.
*