A guard is either a person or an organisation. It may be a person who looks after the safety of people or property, and/or make sure prisoners do not escape. It may also be a part of the military. It can also be an object, a fireguard for example.
... and Margaret,
mother of Henry VII., who did the fourth book.
Translations appeared in Italian (Venice, 1488,
Milan 1489), Spanish (Seville, 1536), Arabic ...