The information from this article is from the fan game King's Quest II: Romancing the Stones or fan fiction and is therefore not canon.
Boris and Olga Stovich were buried in the Castle Graveyard in the Romancing the Stones universe.
Boris and Olga
There was an old couple named Olga and Stovich
Who in truth made quite a nice pair.
They lived with each other for many long years
'Til they wound up in each other's hair.