Citation Hunt

The Wikipedia snippet below is not backed by a reliable source. Can you find one?

Click I got this! to go to Wikipedia and fix the snippet, or Next! to see another one. Good luck!

In page Pope Callixtus III:

"

Borgia was chosen as a delegate of the Diocese of Lerida to the Council of Constance in 1416, but did not partake in the proceedings as King Alfonso V of Aragon was opposed to the council. Because of this he went to Barcelona as a representative of his diocese in a synod. Borgia cared strongly for the reestablishment of the unity of the church; his influence with the Aragonese monarch was the factor that allowed for the conclusion of the accord between the king and the new pope.[citation needed]