Frederik I Oldenburg of Denmark was born 7 October 1471 in Haderslevhus, Haderslev, South Denmark, Denmark to Christian I of Denmark (1426-1481) and Dorothea von Brandenburg (1430-1495) and died 10 April 1533 Gottorf Castle, Schleswig, Schleswig-Holstein, Germany of unspecified causes. He married Anna von Brandenburg (1487-1514) 10 April 1502 JL in Stendal, Saxony-Anhalt, Germany. He married Sophia von Pommern (1498-1568) 9 October 1518 JL in Kiel, Schleswig-Holstein, Germany.
Children
| Name | Birth | Death | Joined with |
| Christian III of Denmark (1503-1559) | 12 August 1503 Gottorf Castle | 1 January 1559 Kolding | Dorothea von Sachsen-Lauenburg (1511-1571) |
| Dorothea of Denmark (1504-1547) | 1 August 1504 | 11 April 1547 Königsberg Schloß | Albrecht von Brandenburg-Ansbach (1490-1568) |
| Name | Birth | Death | Joined with |
| Johann von Schleswig-Holstein-Hadersleben (1521-1580) | |||
| Elizabeth of Denmark (1524-1586) | 14 October 1524 Denmark | 15 October 1586 Gedser, Denmark | Magnus III. von Mecklenburg (1509-1550) Ulrich III. von Mecklenburg-Schwerin (1528-1603) |
| Adolf von Schleswig-Holstein-Gottorf (1526-1586) | 25 January 1526 Flensburg, Schleswig-Holstein, Germany | 1 October 1586 Schloss Gottorf, Schleswig, Schleswig-Holstein, Germany | Christine von Hessen (1543-1604) |
| Anna of Denmark (1527-1535) | |||
| Dorothea of Denmark (1528-1575) | |||
| Friedrich of Denmark (1532-1556) | |||
Footnotes (including sources)
| ‡ General |
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