- Gwyn Ap Tewdwr
Birth - about 999 - Of, , Carmarthenshire, Wales - Maredudd Ap Owain
- Robert I, Duke of "Diablo" Normandy
Birth - about 999 - Of, , Normandy, France - Mieceslas Prince Of Obotrites
- Anund Jakob Prince Sweden
Birth - 999 - Of, , , Sweden - Ivar "Hvide" (unknown)
Birth - about 999 - Of, , Opland, Norway - Kaiser Konstantinos IX. Monomachos von Byzanz
- Geoffrey Count Of Bretange
- Amauri (Amaury), Seigneur Montfort
Birth - about 1000 - Of, EVREUX, Normandy, France - Lancelin de Beaugency
- Geoffroy I "Ferreol" Count Of Gastinois
- Poppo I von Weimar
Birth - about 1000 - Weimar, Germany - Graf Otto II von Lothringen
- Aaron Ap Paen
- Gilbert "Crispin" Count de Brionne
Birth - about 1000 - Of, , Normandy, France - Hildouin Iii Count Montdidier
Birth - 1000 - Of, Montdidier, Somme, France - Geoffroy Ii "Ferreol" Count Of Gastinois
Birth - about 1000 - Of, Chateau Landon, Seine-et-Marne, France - Dreux Count Of Vexin
Birth - about 1000 - Of, , Vexin, France - Niel Ii de Sauveur
- Harald Godfredson
- Rhydderch Ap Tewdwr
Birth - about 1000 - Of Derllys, Gwarthaf, Carmarthenshire, Wales - Alberic de Boves
Birth - about 1000 - Boves, Somme, France - Radomir, Prince Of Bulgaria
Birth - about 1000 - Of, Ohrid, Makedonija, Yugoslavia - Robert S. de (unknown)
- Osbern (unknown)
Birth - about 1000 - Of, , Normandy, France - Alphonso, Count Of Ghesnes
Birth - about 1000 - Of Hedingham, Essex, England - Otto von Polen
Birth - about 1000 - Of, Poznan, Poznan, Poland - Alan Count Of Brittany
Birth - about 1000 - Of, , Brittany, France - William Talvas
Birth - about 1000 - Of, Belleme, Perche, France - Garcia Iii, King Navarre
- Heinrich vom Ardennengau
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