Rumours passed down through generations of the Trevelyan family claim it may have been over-painted by his rival SirJoshuaReynolds.
BBC: Thomas Gainsborough portrait 're-worked by rival'
2.
The works by SirJoshuaReynolds, arguably the dominant English artist of the 18th Century, are both oil portraits of aristocratic families.
BBC: Art gems donated to pay ?25m tax
3.
The big guns of the group are Zoffany (a German immigrant who was bankrolled by George III), Thomas Gainsborough, Joseph Wright of Derby and SirJoshuaReynolds.