How did Constantine I form an alliance with Licinius?

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Constantine I formed an alliance with Licinius following Constantine's victory over Maxentius at the Battle of the Milvian Bridge in 312.12

In February 313, the two emperors met in Mediolanum (modern Milan) to confirm various political and dynastic arrangements. A primary outcome of this meeting was the Edict of Milan, a joint policy that established religious toleration for Christians throughout the empire, effectively ending systematic imperial persecution.1342

This alliance was further solidified by dynastic ties, as Licinius married Constantine’s half-sister, Constantia, in 313. By aligning their interests and guaranteeing religious tolerance, the two leaders were able to rally support and isolate their remaining rival, Maximinus Daia, who was viewed as a persecutor of Christians.52