Describe Your own Tentative timelines, pre 1900

Cornucopia of England:

1245 - The birth of Edmund Crouchback ends in a stillbirth. Then Prince Edward, who IOTL was sickly in his youth, succumbs to his illness soon after. Henry III dies of grief and the throne of England passes to his brother Richard, Earl of Cornwall, who focuses his efforts on England instead of the Holy Roman Empire.

(I might actually try a TLIAW based on this once my exams are over.)
Liberty is Not Well Sold for All the Gold

A Dubrovnik/Ragusa-wank where they eclipse Venice and the maritime Italian city states.