Eusebius says this in The History of the Church...
Clement, whose words we have just been reading, goes on from the passage I have quoted to rebut those who deprecated marriage, by listing the apostles known to have been married men. He says:
Or will they condemn even the apostles? For Peter and Philip had families, and Philip gave his daughters in marriage, while Paul himself does not hestiate in one of his epistles to address his yoke-fellow, whom he did not take round with him for fear of hindering his ministry.
While I am on the subject, I may as well quote another of Clement's interesting stories, to be found in Book VII of his Miscellanies:
We are told that when blessed Peter saw his wife led away to death he was glad that her call had come and that she was returning home, and spoke to her in the most encouraging and comforting tones, addressing her by name: 'My dear, remember the Lord.' Such was the marriage of the blessed, and their consummate feeling towards their dearest.
Those quotations, relevant as they are to this section of my work, must suffice for the moment.
Can anyone that has read this book comment on this a little more?
To me it seems that Peter's wife died after Peter started following Jesus. Because, from what I remember, Peter wasn't a very religious man before he started following Jesus, and in this passage he seems to be very religious as he speaks to his wife.