Kooi, Willem Bartel van der – Adriaen Pieter Twent (1745-1816), 1809 Rijksmuseum: part 3

The picture has something of this: people, portrait, elderly, man, wear, leader, side view, profile, veil, royalty, lid, politician, retro.
Perhaps it’s a painting of a man with white hair wearing a black coat and a blue sash around his neck and a gold.