Lammas family - Kent

[Lammas]

Hello

My x4 great grandfather John Lammas married Sarah Chapel in East Farleigh parish church Kent in 1793.

Looks like the Lammas' came from Loose in Kent (near Maidstone and not far from East Farleigh). Four generations later another John left for New Zealand (married in Hornsey, London 1866)

Can anyone tell me, please, how I can go back further than the 1793 marriage ............?

Thank you
Mark Lammas