Question: What is the date of death of Niko I Dadiani's father?
Sentence (from "Niko I Dadiani"): Of the House of Dadiani, one of the leading Georgian noble families, he succeeded on the death of his father, David Dadiani, but he never ruled in his own right; during his minority, the government was run by regency presided by his mother, Princess Ekaterina, and in 1857, Mingrelia was placed under a provisional Russian administration.
Relevant evidence: Yes