István was the son of Bertalan V (VIII) Frangepán de Veglia but his mother is unknown. The date and place of his birth have not been found.
He died in BET 30 SEP 1388 AND APR 1390. The place is not known.
His wife was Caterina da Carrara, who he married in 1372. The place has not been found. Their only known child was Erzsébet (?-1422).
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István I Frangepán de Veglia |
Frigyes IV Frangepán de Veglia |
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| Event | Date | Details | Source | Multimedia | Notes |
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| Death | BET 30 SEP 1388 AND APR 1390 |
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| Attribute | Date | Description | Details | Source | Multimedia | Notes |
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| Nobility Title | count of Veglia and Modrus |