She was the sixth daughter of Siemowit IV , Duke of Masovia and Alexandra , a daughter of Algirdas , Grand Duke of Lithuania and sister of King Władysław II Jagiełło of Poland .
Head entity: alexandra Q2318426 13
Tail entity: algirdas Q336754 18
Relation (head \u2192 tail): P22
Inverse relation (tail \u2192 head): P40