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
Knights of the Royal Oak set aside as "Royal Oak Day," and "Oak Apple Day" to commemorate the Restoration. Celebration was made by the wearing of oak leaves in the hat; oak apples gilded, with a few leaves surrounding them, were sold in the streets of London. The statue of Charles I of England, at Charing Cross, was also decorated with branches of oak on this day. The holiday is still celebrated today as Oak Apple Day. Anglesey Brecknockshire Cardiganshire Carmarthenshire Caernarvonshire Denbighshire Flintshire Glamorganshire Merionethshire Monmouthshire Montgomeryshire Pembrokeshire Radnorshire Knights of the Royal Oak The Knights of the Royal Oak was an intended order