Frederick married his first cousin Princess Catherine of Württemberg , daughter of William I of Württemberg and his wife Pauline Therese of Württemberg , on 20 November 1845 in Stuttgart , Kingdom of Württemberg .
Head entity: princess catherine of württemberg Q2230153 5 6 7 8
Tail entity: pauline therese of württemberg Q234703 19 20 21 22
Relation (head \u2192 tail): P40
Inverse relation (tail \u2192 head): P25