Which preposition to use with somner

at Occurrences 1%

James Allan died in 1810, and was survived by a son who sold to Mr. Francis Somner at Yetholm a terrier dog named Old Pepper, descended from his grandfather's famous dog Hitchem.

of Occurrences 1%

[FN [h] Somner of Gavelk.

Which preposition to use with  somner