In 1677 Mackenzie became Lord Advocate
and a member of the Privy Council of Scotland. He was therefore
charged with the priority of enforcing persecution laws
against the Covenanters.
He was so relentless and inhumane in office
that he was nicknamed ‘Bluidy’ Mackenzie. He
was in private life a cultivated and learned man writing
elegant essays across a broad range of learning, notably
philosophy and history.
His most famous work is “A Moral Essay
Preferring Solitude to Public Employment”, and “Memoirs
of the Affairs of Scotland from the Restoration of Charles
II.” Is a valuable historical document which was published
later in 1821. Mackenzie was the founder of the Advocate’s
Library in Edinburgh.
He opposed the dethronement of James
II, retiring from his public office to avoid the consequences.
Mackenzie died in May, 1691 at Westminter and was buried
in a mausuleum known as The Black Mausuleum' in Greyfriars
Kirkyard where visitors have experienced being physically
attacked by the 'MacKenzie Polterguist'.