1) Civil parish in Cornwall 
Trewen (Trewynn) is a hamlet and a civil parish in east Cornwall, England, United Kingdom The parish is just east of Bodmin Moor in the River Inny valley and lies in the Registration District of Launceston. Trewen parish is bounded to the north by Egloskerry parish, to the east by St Thomas-by-Launceston, to the south by South Petherwin and to the...