AHC: 1553 Queen Jane?

OTL Lady Jane Grey was Queen for just nine days before she was overthrown by Mary Tudor. She was put on the throne as part of Edwards ‘device’ by the Duke of Northumberland.

What’s the latest possible POD that could lead to her retaining the throne?

I’d argue successfully capturing Mary is vital, but another POD could be the fleet not defecting and giving Mary cannons.

What sort of English reformation would the fifteen year old Queen Jane create? How different would the world be?
 
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