At age 52 John married Isabella Jagiellon , the 22-year - old daughter of Sigismund I the Old , King of Poland , on 2March 1539 .
Head entity: isabella jagiellon Q235591 5 6
Tail entity: sigismund i the old Q54056 14 15 16 17
Relation (head \u2192 tail): P22
Inverse relation (tail \u2192 head): P40