John Og Mackinnon

Identity: eldest son of Sir Lachlan Mòr, but not the next functioning long-term chief.

Role in the line: he is the bridge between Lachlan Mòr and Iain Dubh. The working line is: Lachlan Mòr → John Og → Iain Dubh.

Death: he died before his father, so he did not become the major active chief in the way Iain Dubh did. The family tradition says he died around the time his only son was born, which makes him structurally important but historically faint.

Marriage connection: tradition gives him a wife from the MacDonald of Castleton line, linking the senior MacKinnon succession again into the Skye and MacDonald political world.

Legacy: his importance is genealogical, not military. Because he left a male heir, Iain Dubh, the chiefship passed to Lachlan Mòr’s grandson instead of sideways to the Antigua or Mishnish branches.