Dan O’Sullivan is a retired history teacher and lecturer. He gained his degrees in history from the universities of Cambridge and East Anglia. He has previously published Tudor Britain (Longman) and In Search of Captain Cook (Taurus). His most recent one was The Reluctant Ambassador (Amberley, 2016), which is about the life of Sir Thomas Chaloner, who ended his career as English ambassador to Spain, 1562-5.