Quercus robur the oak tree at Boscobel House, where the future King Charles II hid from his Parliamentarian pursuers in 1650 during the English Civil War; the tree has since been known as the Royal Oak. This event was celebrated nationally on 29 May as Oak Apple Day, which is continued to this day in some communities. ‘The Royal Oak’ is the third most popular pub name in Britain (541 in 2007) and has been the name of eight major Royal Navy warships. The naval associations are strengthened by the fact that oak was the main construction material for sailing warships. The
Oak Apple Day to God, for the great Blessing and Mercy he hath been graciously pleased to vouchsafe to the People of these Kingdoms, after their manifold and grievous Sufferings, in the Restoration of his Majesty..." The public holiday was formally abolished in the Anniversary Days Observance Act 1859, but the date retains some significance in local or institutional customs. It is, for example, still observed as Founder's Day by the Royal Hospital Chelsea, which was founded by Charles II in 1681. Traditional celebrations to commemorate the event often entailed the wearing of oak apples (a type of plant gall, possibly known in