Géza I, Hungarian king of the Árpád family, reigned from 1074 to 1077. His father was King Béla I, his mother was Queen Richeza. He was given the name Magnus at his baptism.

Géza was at odds with his cousin Solomon for a long time, who in 1063 won the crown for himself and forced his nephew to leave his country. In 1064, he retreated with his Polish armies and signed a treaty in which he and his brother Ladislaus recognized the power of Solomon.

In 1071, new tensions arose between the duke and King Solomon, because Géza defeated Solomon in the battle of Mogyoród in 1074, thus obtaining the royal title.

The ruler had 3 children, but Géza did not live to see them young. He died in 1077. His younger brother Ladislaus followed him on the throne.

The ducal and royal coins of Géza I follow the medal design of St. Stephen, with the difference that on the obverse the place of the four triangles in the arms of the cross, the variable side marks, which show great diversity on individual specimens, circle, dot, cross, crescent, wedge etc., were occupied. The inscription Pannonia can be read on the background.