in English is:

monarchy

Mutations

Soft:deyrnasiaeth
Nasal:nheyrnasiaeth
Aspirate:theyrnasiaeth

Use

y teyrnasiaeth hwn
fy nheyrnasiaeth i
dy deyrnasiaeth di
ei deyrnasiaeth ef/o
ei theyrnasiaeth hi
ein teyrnasiaeth ni
eich teyrnasiaeth chi
eu teyrnasiaeth nhw/hwy
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