Detailed Instructions: You will be given a context, a subject and a relation. Your task is to generate a question based on the subject and relation. The generated question should include the given subject. Try to use a minimum number of words that are not present in either context, subject or relation while generating question.
Q: Context : On their retreat through northern Italy, they were intercepted and defeated in the battle of Mediolanum (near present-day Milan) by Gallienus' army, which had advanced from Gaul, or from the Balkans after dealing with the Franks.
Subject : Gallienus
Relation : spouse
A:
What is Gallienus's spouse's name?