Dunyvaig Castle, (Scottish Gaelic: "Dùn Naomhaig" , Anglicised "Fort of the galleys", also known as "Dunnyveg") is located on the south side of Islay, in Argyll, Scotland, on the shore of Lagavulin Bay, 4 km from Port Ellen. The castle was once a naval base of the Lord of the Isles, chiefs of Clan Donald. It was held by the chiefs of the Clan MacDonald of Dunnyveg.
Dunyvaig Castle, (Scottish Gaelic: "Dùn Naomhaig" , Anglicised "Fort of the galleys", mostly known as "Dunnyveg") is located on the south side of Islay
I changed the wording from also known to normally known. This changes the meaning of the sentence and I think it confuses the system. 
( z1 be-located-at :ARG1 ( z2 castle :name ( z3 name :op "Dunyvaig" :op "Castle" ) ) :ARG2 ( z4 side :mod ( z5 south ) :part-of ( z6 island :name ( z7 name :op "Islay" ) ) ) )