The oak tree has a long history of folklore throughout Europe. The oak was sacred to many people, including the ancient Greeks, the Norse and the Celts. It was often associated with the gods of thunder as oak was often split by lightning. This is probably because oaks are often the tallest tree in any area. More recently oak was the sacred wood burnt by the druids for their mid-summer sacrifice. In fact the word 'druid' means 'oak man'.  In modern history, tradition has it that Charles II hid in an oak tree at Boscobel when pursued by the Roundheads. Since then, children wear oak leaves on May 29th to commemorate Royal Oak Day (now known as Oak Apple Day).