Nielsen Hayden genealogy
Ancestors of Boleslaus I of Bohemia
Abt 909 - 967 (~ 58 years) ┌── Borivoj I of Bohemia (Abt 840 - Abt 889)
┌── Vratislaus I of Bohemia (Abt 888 - 13 Feb 921)
│ │ ┌── Slavibor, Prince of Pvov
│ └── 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)