Had a legitimate claim to the throne, so her supporters pushed the idea of Elizabeth being born 'out of wedlock'. And because she was catholic she was supported as the legitimate heir by other catholic countries
Borders
Border between England and Scotland was hard to defend. The border was far away from London, and the English troops, which meant lots of Scottish raids
The mother
Mary QoS's mother (Mary of Guise), was French and brought French troops over
