Simplify the following text for a Grade 5 native English-speaking person.
Original: After his death the city was called Constantinople ( Greek Î Ï Î 1\/2 Ï Ï Î Î 1\/2 Ï Î Î 1\/2 Î Ï Ï Î Î '' Î Ï or Konstantinoupolis ) ( ` city of Constantine ' ) .
Simplified: Byzantium ( Greek : Î ' Ï Î Î Î 1\/2 Ï Î Î Î 1\/2 ) was an ancient Greek city .