Tower was often a safer place than other prisons in London such as the Fleet, where disease was rife. High-status prisoners could live in conditions comparable to those they might expect outside; one such example was that while Walter Raleigh was held in the Tower his rooms were altered to accommodate his family, including his son who was born there in 1605. Executions were usually carried out on Tower Hill rather than in the Tower of London itself, and 112 people were executed on the hill over 400 years. Before the 20th century, there had been seven executions within the castle on Tower Green; as was the case with Lady Jane Grey, this was reserved for prisoners for whom public execution was considered dangerous. After Lady Jane Grey's execution on 12 February 1554, Queen Mary I imprisoned her sister Elizabeth, later Queen Elizabeth I, in the Tower under suspicion of causing rebellion as Sir Thomas Wyatt had led a revolt against Mary in Elizabeth's name. The Office of Ordnance and Armoury Office were founded in the 15th century, taking over the Privy Wardrobe's duties of looking after the monarch's arsenal and valuables. As there was no standing army before 1661, the importance of the royal armoury at the Tower of London was that it provided a professional basis for procuring supplies and equipment in times of war. The two bodies were resident at the Tower from at least 1454, and by the 16th century they had moved to a position in the inner ward. The Board of Ordnance (successor to these Offices) had its headquarters in the White Tower and used surrounding buildings for storage. In 1855 the Board was abolished; its successor (the Military Store Department of the War Office) was also based there until 1869, after which its headquarters staff were relocated to the Royal Arsenal in Woolwich (where the recently closed Woolwich Dockyard was converted into a vast ordnance store). Political tensions between Charles I and Parliament in the second quarter of the 17th century led to an attempt by forces loyal to the King to secure the Tower and its valuable contents, including money and munitions. London's Trained Bands, a militia force, were moved into the castle in 1640. Plans for defence were drawn up and gun platforms were built, readying the Tower for war. The preparations were never put to the test. In 1642, Charles