This is Lt Col Isaac TOBY RM , ancestor of my late husband .My father-in-law
used to refer to this portrait as simply "The Ancestor" . I've done all the detective work!

Isaac had an active career at sea but finally was Barrack Master at Devonport in the 1850s.

I'm pretty sure that Isaac had no children .His sister Martha Haydon TOBY married Richard OLIVER in the 1830s . They were gggrandparents of my husband John Rainsford Walrond OLIVER.

One of Richard and Martha's children was Isaac Toby OLIVER, who to my knowledge , didn't marry.