What was significant about the Second Battle of Ypres?

One was to hold a leash on a despot and future despots to come, another was set to ensure no despots ever came to power.

The founder of the byzantine  empire  and its first  emperor,  constantine  the great,  movedthe  capital of the roman empire  to the city of byzantium in 330 ce, and renamed it  constantinople.  constantine  the great also legalized christianity, which had previously been persecuted in the  roman empire.