Nielsen Hayden genealogy
Ancestors of Bretislaus I
1005 - 1055 (~ 53 years) ┌── Borivoj I of Bohemia (Abt 840 - Abt 889)
┌── Vratislaus I of Bohemia (Abt 888 - 13 Feb 921)
│ └── St. Ludmila of Bohemia (Abt 850 Melnik, Bohemia - 15 Sep 921 Tetin, Bohemia) =>
│
┌── Boleslaus I of Bohemia (Abt 909 - 15 Jul 967)
│ └── Drahomira of Stodor (Between 877 and 890 - Aft 934)
│
┌── Boleslaus II of Bohemia (Abt 932 - 7 Feb 999)
│ └── Biagota von Stockow
│
┌── Oldrich of Bohemia (Abt 970 - 9 Nov 1034)
│ └── Emma of Melnik (Bef 950 - Between 1005 and 1006)
│
Bretislaus I (Between 1002 and 1005 - 10 Jan 1055)
│
│ ┌── Kresina
└── Božena ( - 1052)