Can merched y wawr

Can someone translate the line from Can Merched y Wawr - ‘Fe bery popbeth hardd’ in particular the word bery?

Sara, I think that ‘bery’ is a shortened verb from ‘parhau’ to remain, to last , endure etc so i guess, Everything will remain beautiful’

Thank you, I thought it must be a literary form of something like parhau.