The Gesta Hungarorum names "Geichæ et Ladislai" as sons of "fratris sui Belæ" when recording that King András obtained their agreement to the future succession of his son Salomon. The Kronika Wegiersko-Polska names "Geyzam et Ladislaum" as the two older sons of "Bela" and his wife "rex Polonie filiam", adding that they were both born in Poland. He was sent as a hostage to the imperial court in [1062/63], at which time he must have been unmarried in line with the custom of not sending married men as hostages to foreign courts. He sought refuge in Poland after his father's death in 1063, but later returned to Hungary, made peace with King Salamon, and was appointed Duke between March and Gran. This must have occurred in [1064/67] if it is correct that Géza's second marriage took place before 1067.... The Chronicon Posoniense records disputes in 1071 between "Salomon rex" and "duce magno Geyza Ungarorum". Relations deteriorated and Géza, possibly with at least financial support from Emperor Mikhael VII, defeated King Salamon at Mogyorod, forcing the king to withdraw to the western border and from there to Germany.
Géza succeeded his cousin in 1074 as GÉZA I King of Hungary. The Chronicon Posoniense records that "Salomon" was deposed in 1074 and "Magnus rex" crowned in 1075[525]. "Magnus qui et Geysa supremus Hungarorium Dux postea…rex consecratus, Belæ regis filius" founded the monastery of St Benedict, Gron, in the presence of "Ladislao Duce germano meo…Iula Comite Palatino", by charter dated 1075.
The Gesta Hungarorum records that Géza succeeded King Salomon but died after a reign of three years and was buried at "Waciæ [Vác]". The Chronicon Varadiense records the death "VIII Kal Mai" in 1077 of "Geysa primogenitus Belæ regis" and his burial "in ecclesia Vaciensi quam ipse construxit". 1
Research Notes: