James I

James I of the United Kingdom, known in Scotland as James VI, succeeded Elizabeth I in 1603, and continued her Protestant reforms. According to the Eighth Doctor, his accent was so thick, members of his new English court required a translator. A close advisor to the new king was William Lethbridge-Stewart, an ancestor of Alastair Gordon Lethbridge-Stewart. (NA: The Dying Days, Birthright) An influential version of the Bible was ordered by him, and eventually bore his name. The First Doctor and Vicki once passed by the room where the translators were busy working on what would become the King James Bible. According to Barbara Wright, James' rule was characterised by relative religious tolerance. Though a staunch Protestant, he discouraged persecution of Catholics. Barbara claimed that he realised that "to govern well it made sense to unify people rather than drive them apart". (MA: The Plotters)

For a brief time, the TARDIS came into James' possession, but he was mostly annoyed by it, calling it a "wooden puzzle box" because he and his courtiers could not gain entrance to it. In the end, he entreated the First Doctor to perform an exorcism upon it, just to ensure it was not possessed of evil spirits. The Doctor agreed, and performed an elaborate ceremony at the Guildhall in London. During the middle of this ceremony, eagerly attended by James, the Doctor and his three companions entered the TARDIS and dematerialised. (MA: The Plotters)

Behind the scenes
In the real world, there's some question as to whether the title James I of the United Kingdom would be appropriate, since the United Kingdom was not technically formed until 1707. He's most often styled, James I of England and James VI of Scotland. However, the Eighth Doctor specifically calls him James I of the United Kingdom in The Dying Days.