 Complete the following phrase:  He was appointed Prefect and Second Person of the royal artillery of Scotland S. D. N. Regis Machinarii Bellitarii Prefecti on 23 August 1569, during the Regency of the James Stewart, Earl of Moray. In 1570, Chisholm joined William Kirkcaldy of Grange in the garrison of Edinburgh Castle that remained loyal to Mary, Queen of Scots. During the following Lang Siege of the Castle and 