Nielsen Hayden genealogy
Descendants of Richiza of Poland
1116 - Aft 1155 (> 39 years)Father: Boleslaw III "Wrymouth", King of Poland (20 Aug 1085 - 28 Oct 1138)
Mother: Salome von Berg-Schelklingen (Bef 1101 - 27 Jul 1144)
Richiza of Poland (12 Apr 1116 - Aft 25 Dec 1155)
Volodar of Minsk ( - Aft 1167)
   └─ Sofie of Polotsk (Abt 1141 - 5 May 1198)
    Valdemar I den Store, King of Denmark (14 Jan 1131 - 12 May 1182 Vordingborg, Denmark)(m. Abt Sep 1157)
       ├─ Richiza of Denmark ( - 8 May 1220 bur.Ringsted, Zealand, Denmark)
       │ Erik X Knutsson, King of Sweden (Abt 1180 - 10 Apr 1216)(m. 1210)
       │     + Birger Magnusson (Abt 1200 - 21 Oct 1266)(m. Abt 1235)
       ├─ Sophie Valdemarsdatter of Denmark (1159 - 1208)
       │ Siegfried III von Orlamünde (Abt 1155 - 1206)(m. 1181)
       │    │ + Heinrich II von Schwarzburg (Between 1150 and 1155 - 20 Feb 1236)
       │    └─ Hermann II von Orlamünde (Abt 1184 - 27 Dec 1247) =>
       │     + Beatrix von Meran (1210 - 9 Feb 1270)
       ├─ Valdemar II Sejr, King of Denmark (28 Jun 1170 - 28 Mar 1241)
       │ Berengaria (Abt 1194 Coimbra, Portugal - 27 Mar 1221 Ringsted, Zealand, Denmark)
       │ (m. Between 1213 and 1214)
       │ (m. Between 1213 and 1214)
       │    ├─ Erik IV-VI, King of Denmark (1216 - 10 Aug 1250) =>
       │    │ + Jutta of Saxony (Abt 1224 - ??)(m. 17 Nov 1239)
       │    ├─ Sophie of Denmark (1217 - 2 Nov 1247 Flensburg, Schleswig-Holstein, Germany) =>
       │    │ + Johann I of Brandenburg (1213 - 4 Apr 1266)(m. 1236)
       │    │ + Mechtilde von Holstein (1225 - 1288)(m. 25 Apr 1237)
       │    └─ Christoffer I, King of Denmark (1219 - 29 May 1259 Ribe, Jutland, Denmark) =>
       │     + Margarete Tczewsko-Lubiszewska (Between 1230 and 1234 -
       │     Dec 1282 Rostock, Mecklenburg-Vorpommern, Germany)(m. 1248 Fehmarn, Ostholstein, Germany)
       │     Dec 1282 Rostock, Mecklenburg-Vorpommern, Germany)(m. 1248 Fehmarn, Ostholstein, Germany)
       └─ Helene of Denmark (Abt 1180 - 22 Nov 1233)
        Wilhelm of Brunswick-Lüneburg (11 Apr 1184 Winchester, Hampshire, England -
        13 Dec 1213 Lüneburg, Lower Saxony, Germany)(m. Jul 1202 Hamburg, Germany)
        13 Dec 1213 Lüneburg, Lower Saxony, Germany)(m. Jul 1202 Hamburg, Germany)
           └─ Otto I of Brunswick-Lüneburg (1204 - 19 Jun 1252) =>
            + Matilde von Brandenburg (Abt 1210 - 10 Jun 1261)