Asking how many generations back and how far back you can go are not the same thing.

For example one of my lines goes back 9 generations which takes me to 1450
Whilst another goes back 12 generations to 1620.
Another yet takes me 8 generations to 1674, etc.
The furthest back I go is 18 generations to 1370.
Cheers
Guy
As we have gained from the past, we owe the future a debt, which we pay by sharing today.