Claim: Juliet Marillier wrote the novel Son of the Shadows with a genre of historical fantasy.
Evidence: Son of the Shadows is an historical fantasy novel by Juliet Marillier and the second book in the Sevenwaters Trilogy first published in 2000. 
Juliet Marillier Historical Fantasy In this novel, Liadan grows up in Sevenwaters with her twin brother Sean and her older sister Niamh.