Here is Mercedes Rochelle’s excellent post about Tostig Godwinson, brother of Harold II. He was Earl of Northumbria for ten years before the rebellion
in that region in late 1065. He then tried to overthrow Harold from the south in May and from the north in September, with Norwegian support, ending in his defeat and death at Stamford Bridge. With Harold, he had taken part in a partial conquest of Wales in 1063. The Kirkdale Sundial, which also reads “IN TOSTI DAGVM EORL+” (“in Earl Tostig’s day”), is pictured left.
The parallels with George, Duke of Clarence (above right), who acted against Edward IV in the 1469-70 readeption and apparently sought to do so in 1477 are interesting.