Commentary
Weis: "As printed in the past, Bela I and Andrew I, brothers and successive Kings of Hungary, were shown as sons of Ladislas I, King of Hungary, by Premyslava, dau. of St. Vladimir, based on Table I of Baumgarten. However, the chronology can now be shown to be in error for Premyslava, and Moriarty's The Plantagenet Ancestry, p. 86, shows the brothers to be children of Vasul, King of Poland, dead 1038, by an unknown wife. Vasul was the son of Mihaly (Michael), a regent in Poland. Isenburg (1976 ed.) confirms all this (Table 104, Europaische Stammtafeln) and shows Michael as bro. of Gees and son of Tasking, d. 972."
Family
ClaimDetailEvidence
FatherVaszoly Prince of Hungary (~976-~1039) [S756] [S938]
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Mother_____ of Bulgaria (e977-) [S938]
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SpouseAnastasia Iaroslavna (~1023-~1096) 
Child +Adelaide of Hungary (~1040-1062) [S756] [S938] [S3151]
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Attributes
ClaimDetailEvidence
GenderMale
NameAndrás I, King of Hungary [S938]
Nickname: Andras the Catholic
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NameAndrew I, King of Hungary [S756]
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FatherVaszoly Prince of Hungary (~976-~1039) [S756] [S938]
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Mother_____ of Bulgaria (e977-) [S938]
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Timeline
ClaimDateDetailAgeEvidence
Birthabt 1014Hungary [S938]
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Marriageabt 1039Anastasia Iaroslavna (~1023-~1096) [S756] [S938] [S3201]
Weis gives a marriage of about 1046, but also shows their daughter's marriage in about 1058 and the birth of their grandchild about that same time. It is probably they marriage several years before.
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Title1046King of Hungary [S756] [S938]
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Death[Autumn] 1060 [S756] [S938]
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Sources
IndexTitle
[S756] Weis, Frederick Lewis, "Ancestral Roots of Sixty Colonists Who Came To New England before 1700, 7th Ed." (Genealogical Publishing Co., Inc., Baltimore, 1999).
[S938] Cawley, Charles, "Foundation of Medieval Genealogy (Medieval Lands - Hungary)" (2006-7 (v1.2 Updated 13 February 2007)) (https://fmg.ac/Projects/MedLands/HUNGARY.htm).
[S3201] Cawley, Charles, "Foundation of Medieval Genealogy (Medieval Lands - Russia)" (https://fmg.ac/Projects/MedLands/RUSSIA, Rurik.htm).