Hi Ron,
The "Norwegian" one lost June 7 1918 was owned by the shipping company William Hansen & Co, Bergen. She was built in 1899 in Bergen and was 1119 grt when lost. She was torpedoed by u-boat UB-108 when sailing in convoy Tyne - Rouen.
She was managed by Pelton S.S. Co Ltd., Newcastle when lost.
The Norwegian Diana built in 1904 (same yard - 1155 grt) was lost September 26 1940 when she dissapered near Milford Haven. Probably mined.
Another Diana built in 1904 was lost in 1918. This is a German ship built in Flensburg of 1046 grt. She stranded in Norway January 30 1918 and sank when her boiler exploded.
Hopes this is to some help :-)
Merry Christmas from Norway !
Erling