Nielsen Hayden genealogy
Ancestors of Przemysl Ottokar II, King of Bohemia
Abt 1230 - 1278 (~ 48 years)
┌── Wladislaw II, King of Bohemia 
(Abt 1110 - 18 Jan 1175)(m. 1153) =>
(Abt 1110 - 18 Jan 1175)(m. 1153) => ┌── Przemysl Ottokar I, King of Bohemia (Abt 1155 - 15 Dec 1230)(m. Abt 1198)
(Abt 1155 - 15 Dec 1230)(m. Abt 1198) │ └── Jutta of Thuringia (m. 1153) =>
(m. 1153) => │
┌── Wenceslas I, King of Bohemia (1205 - 22 Sep 1253)(m. 1224)
(1205 - 22 Sep 1253)(m. 1224) │ │
│ │ ┌── Béla III, King of Hungary, Croatia, Dalmatia, and Rama (Abt 1148 - 18 Apr 1196)
(Abt 1148 - 18 Apr 1196) │ │ │ (m. Abt 1171) =>
│ └── Constance of Hungary ( - 4 Dec 1240)(m. Abt 1198)
( - 4 Dec 1240)(m. Abt 1198) │ └── Anna de Châtillon (1154 - 1184)(m. Abt 1171) =>
(1154 - 1184)(m. Abt 1171) => │
Przemysl Ottokar II, King of Bohemia (Abt 1230 - 26 Aug 1278)
│
│ ┌── Frederick Barbarossa, Holy Roman Emperor (1122 - 10 Jun 1190 Saleph River, Cilicia, Anatolia)
(1122 - 10 Jun 1190 Saleph River, Cilicia, Anatolia) │ │ (m. 9 Jun 1156 Würzburg, Germany) =>
│ ┌── Philip II, King of Germany (1177 - 21 Jun 1208 Bamberg, Bayern, Germany)(m. 25 May 1197)
(1177 - 21 Jun 1208 Bamberg, Bayern, Germany)(m. 25 May 1197) │ │ └── Beatrice of Burgundy (Abt 1144 - 15 Nov 1184 Jouhe, Jura, France)
(Abt 1144 - 15 Nov 1184 Jouhe, Jura, France) │ │ (m. 9 Jun 1156 Würzburg, Germany) =>
│ │
└── Kunigunde von Hohenstaufen (Between Jan 1202 and Mar 1202 - 13 Sep 1248 bur.St. Veit, Prague, Bohemia)
(Between Jan 1202 and Mar 1202 - 13 Sep 1248 bur.St. Veit, Prague, Bohemia) (m. 1224)
│
│ ┌── Isaac II Angelos, Emperor of Byzantium (Constantinople;Sep 1156 - Jan 1204) =>
(Constantinople;Sep 1156 - Jan 1204) => └── Irene Angelina (Abt 1181 Constantinople - 27 Aug 1208 Hohenstaufen Castle, Bavaria)(m. 25 May 1197)
(Abt 1181 Constantinople - 27 Aug 1208 Hohenstaufen Castle, Bavaria)(m. 25 May 1197) └── (First wife of Isaac II Angelos) ( - Bef 1185) =>
( - Bef 1185) =>