in English is:

Epiphany

,

Twelfth Night

Mutations

Soft:(no mutation)
Nasal:(no mutation)
Aspirate:(no mutation)

Use

yr Ystwyll hwn
fy Ystwyll i
dy Ystwyll di
ei Ystwyll ef/o
ei Ystwyll hi
ein Ystwyll ni
eich Ystwyll chi
eu Ystwyll nhw/hwy
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