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Spoilers from the books and/or games to follow!

Ola Harsheim (d. November 1267) was one of Stefan Skellen's adjutants who was assigned to Skellen's gang tasked with finding Ciri. He also served alongside Dacre Silifant under the command of General Markus Braibant, where they were sent to suppress the uprising in Nazair. During the hunt for Ciri, he and his group were sent in to Claremont along with fellow adjutant Bert Brigden and his men, to investigate about some letters sent by Leo Bonhart to his cousin Houvenaghel about a fight in a arena.

Later, in Tarn Mira, he was accidentally killed with a orion by Stefan Skellen, who was trying to hit Ciri.