Nielsen Hayden genealogy
Ancestors of Gertrude-Olisava of Poland
Abt 1020 - 1107 (~ 87 years)
┌── Mieszko I, Duke of the Polans 
(Abt 935 - 25 May 992)(m. 955) =>
(Abt 935 - 25 May 992)(m. 955) => ┌── Boleslaw I Chrobry, King of Poland (Abt 967 - 17 Jun 1025)
(Abt 967 - 17 Jun 1025) │ └── Dobrawa of Bohemia ( - 977)(m. 955) =>
( - 977)(m. 955) => │
┌── Mieszko II Lambert, King Of Poland ( - May 1034)(m. 1013)
( - May 1034)(m. 1013) │ │
│ │ ┌── Dobromir, Ruler of Lusatia
│ └── Emnilda of Lusatia (Between 970 and 975 - Between 1013 and 1017)
(Between 970 and 975 - Between 1013 and 1017) │
Gertrude-Olisava of Poland (Abt 1020 Krakow, Malowpolskie, Poland - 4 Jan 1107)
│
│ ┌── Hermann I of Lotharingia (Abt 925 - 16 Jun 996) =>
(Abt 925 - 16 Jun 996) => │ ┌── Ezzo of Lotharingia (Abt 955 - 21 May 1034)
(Abt 955 - 21 May 1034) │ │ └── Helwig von Dillingen =>
=> │ │
└── Richeza of Lotharingia (Abt 998 - 21 Mar 1063 Saalfield, Thuringia, Germany)(m. 1013)
(Abt 998 - 21 Mar 1063 Saalfield, Thuringia, Germany)(m. 1013) │
│ ┌── Otto II, Holy Roman Emperor (955 - 7 Dec 983 Rome) =>
(955 - 7 Dec 983 Rome) => └── Mathilde von Sachsen (979 - 4 Dec 1025 Echtz, Düren, Germany)
(979 - 4 Dec 1025 Echtz, Düren, Germany) └── Theophano (Between 955 and 956 - 15 Jun 991 Nijmegen, Netherlands)
(Between 955 and 956 - 15 Jun 991 Nijmegen, Netherlands)