Klára was the daughter of György Apafi de Apanagyfalu and Anna Bánffy de Losoncz. The date and place of her birth have not been found.
Her husband was János Lázár de Szentanna. They were married, but the date and place have not been found. Their seven known children were István (?-?), Ferenc (?-?), János (?-?), Imre (?-?), Orsolya (?-?), Mihály (?-?) and István (?-?).
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