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"Plas' can mean 'mansion/palace' and Rhianfa,'maiden-place'.
hall, mansion, palace
llys (court, hall, palace)neuadd (hall)plas (hall, mansion, palace)
Plas Johnson was born in 1931.
Jan Plas was born in 1945.
Jan Plas died in 2010.
Thierry Plas was born in 1959.
Plas Mynach was created in 1883.
Olivier De Plas was born in 1968.
Pieter van de Plas was born in 1585.
Pieter van de Plas died in 1661.
Pierre de Plas has written: 'La Guardia Airport'