Disambiguation evidence for John I, Duke of Opava-Racibórz via surface form

"John I, Duke of Opava-Racibórz"

Triples (2)

Triples where some other subject referred to this entity as "John I, Duke of Opava-Racibórz".

Nicholas II of Opava → child →
"John I, Duke of Opava-Racibórz"
ⓘ
Nicholas II of Opava → successor →
"John I, Duke of Opava-Racibórz"
ⓘ