[3][4] His mother seems to have been his father's first wife, Sophia, because Géza's Byzantine second wife—whose baptismal name is unknown—returned to her homeland after her husband's death.

[8] According to the Illuminated Chronicle both Coloman and Álmos accompanied their uncle on a military campaign against Bohemia in the spring of 1095.

[9][10] Before reaching the border of his kingdom, Ladislaus I "was overcome by a grave infirmity"[11] and decided to appoint Álmos as his heir.

[18] This report shows that Álmos only acknowledged his brother's rule in exchange for receiving the one-time ducatus or duchy of their father and grandfather, which encompassed one-third of the kingdom.

[18][19] After Coloman's victories over the marauding crusaders in 1096, Henry IV, Holy Roman Emperor, whom Ladislaus I had supported against Pope Urban II in his last years, wrote a letter to Duke Álmos.

[22][23] Historian Gyula Kristó writes that the fact that his brother, Álmos had for years had a close relationship with Emperor Henry may also have influenced Coloman's decision.

[25] However, the commanders of the two troops started negotiations and decided not to fight against each other, compelling Coloman and Álmos to make a peace.

[31] King Coloman decided to take advantage of the absence of Álmos—who had made a pilgrimage to the Holy Land—and seized his duchy in 1107 or 1108.

[31] Upon his request, Henry V of Germany invaded Hungary and laid siege to Pressburg (Bratislava, Slovakia) in September 1108.

[35][31] At the same time, Duke Svatopluk of Bohemia, who also supported Álmos, made an incursion into the regions north of the Danube.

[31][36] Although the emperor's attempt to take Pressburg was also a total failure, he could persuade Coloman to forgive his rebellious brother, who thus return to Hungary.

[41] His peaceful succession proves that the safety measures Coloman had implemented to prevent Álmos from aspiring the throne were effective.

[42][43] According to the Illuminated Chronicle, the blind Álmos, "fearing death at the hands of King Stephen",[44] fled to the Byzantine Empire.

[49] He adds that king Stephen II "sent his envoys to the emperor and demanded that" Álmos "be expelled from"[50] the Byzantine Empire, but his request was rejected.