Talk to Elki in the Bat's Lair Inn; his grandfather is buried at a monument at the top of Zegham Hill in North Gustaberg. He gives you to the key itemBouquet for the Pioneers lay at the foot of the grave.
Follow the paths up to the top of Zegham Hill in North Gustaberg to find the monument at J-7.
Examine the Palborough Pioneers Monument to place the bouquet; you see the name of Elki's ancestor, Omran, and a partially readable name, Vig****t O**.
Talk to Elki again to complete the quest. He doesn't seem to recognize the partial name but he might if you get more information.