On 8 February 1587, Mary, Queen of Scots, was executed at Fotheringhay Castle. Her death marked the culmination of nearly two decades of captivity in England, during which she had been repeatedly accused of involvement in various conspiracies against her cousin, Queen Elizabeth I. As a prominent Catholic claimant to the English throne, Mary had long served as a focal point for those who sought to challenge the Elizabethan religious settlement and the legitimacy of the Queen’s rule.

The decision to proceed with the execution was a fraught political necessity for Elizabeth, who had resisted calls from her advisors to eliminate the Scottish queen for many years. However, the discovery of the Babington Plot, which aimed to assassinate Elizabeth and place Mary on the throne, provided the definitive evidence required to secure a conviction for treason. By signing the death warrant, Elizabeth finally removed a significant dynastic rival, though the act was not without profound international consequences.

The execution had a lasting impact on the geopolitical landscape of the late sixteenth century:

• It effectively ended the immediate threat posed by Mary as a figurehead for domestic Catholic rebellion.
• The event significantly intensified diplomatic and military tensions between England and the Catholic powers of Europe.
• It served as a direct provocation to King Philip II of Spain, contributing to the eventual launch of the Spanish Armada.
• The death of a sovereign queen caused a scandal across the continent, challenging contemporary notions of royal inviolability.

Ultimately, the removal of Mary did not bring the stability Elizabeth had hoped for, but rather accelerated the slide toward open conflict with Spain. While the execution successfully neutralised a persistent internal danger, it solidified the religious divisions of the era and ensured that the final years of the Tudor period would be defined by the struggle to defend the Protestant state against external threats.