Most of the life of Petko Kiryakov was not unveiled by historians but by the prominent Bulgarian writer Nikolai Haitov, who wrote a novel and a script which was turned into a TV series, which became a favourite of most Bulgarians.
Petko was the subject historian writers
( z1 person :name ( z2 name :op "Petko" ) :ARG0-of ( z3 write :ARG1 ( z4 subject ) ) :mod ( z5 historian ) )