Alternatively, Instead of Artemis, why not have his ancestor be one of her Nymph hunting partners.
Or something to that effect. Similar powers, less hassle.
“She'd become a governess. It was one of the few jobs a known lady could do. And she'd taken to it well. She'd sworn that if she did indeed ever find herself dancing on rooftops with chimney sweeps she'd beat herself to death with her own umbrella.”
― Hogfather