OK. This is the mosque of Tok Ku Paloh, a very prominent 19th Century religious man said to be of saintly status, situated some 3 km outside the city of Kuala Terengganu. The full official name of the mosque is Masjid (mosque of) Almarhum (the deceased) Engku Saiyid Abdul Rahman Tok Ku Paloh.
His real name is Saiyid Abdul Rahman, Saiyid being an inherited title signifying him as from the lineage of prophet Muhammad SAW. The title Engku is a calling attributed to some members of the royal family... and in some countries like Terengganu, a descendant of the prophet is considered a royalty.
Tok is short form for Datuk or Datok (in normal usage a calling for a grandfather, also for a respected elder) and Ku being a short form for Engku. As he was based mainly in Kampung (village) of Paloh where this mosque is situated at, thus Saiyid Abdul Rahman is known as Tok Ku Paloh.
Oh! This latest trip to the East Coast was actually made to visit and take pictures of some chosen mosques. It is for a coffee-table book project we're working on for a certain publication.