This ally of Holy Roman Emperor Henry II took most of the Carpathian basin as the first Arpad to unite a group of tribes which had broken from the Khazars.
This monarch's Giselle supplied Bavarian knights who helped him defeat Koppany near Pannonhalma Abbey, where Astrik was installed by his father Geza. His country's constitution was named for an item he received from Sylvester II, the Holy Crown, while his decaying hand remains one of his country's most important relics. This ally of Holy Roman Emperor Henry II took most of the Carpathian basin as the first Arpad to unite a group of tribes which had broken from the Khazars. For 10 points, identify this Magyar prince, a saint who became the first King of Hungary, whose Christian name was chosen in honor of the first disciple to be martyred.
This monarch's Giselle supplied Bavarian knights who helped him defeat Koppany near Pannonhalma Abbey, where Astrik was installed by his father Geza.
Saint {Stephen} I of Hungary [or {Szent Istvan} I; or {Vajk} of {Esztergom}]