The legacy of executed martyrs shaped future party politics in England.

Evidence

These executions were of lasting significance. Martyrs for religion there had been in plenty. Great Ministers of State and public men had fallen in the ruin of their policies. But here were the first martyrs for the sake of Party. — Winston Churchill, A History of the English-Speaking…, 1235

Categorization

• corroborated: 2 independent passages support this claim — Winston Churchill, A History of the English-Speaking…, 1235
• XREF: connects to: Mary’s execution severed England’s last link to its past. — Garrett Mattingly, The Defeat of the Spanish Armada, 69