The galley Aileach.

[Pericles]

IIRC, some time ago there was a thread about the fitting of rudders to Viking longships in place of the starboard mounted steering oar. It's taken some time and good luck to find the relevant site again, but the description is interesting.

"Celtic Galleys are distinguishable from Norse longships by having a straight sternpost on which a rudder is hung, instead of a steering-oar over the starboard side. The design of Aileach's tiller was difficult as there are no tillers represented in the carvings. Aileach has a double-handed tiller, curving around her wide stern. The other major difference between Celtic and Norse vessels is that the Celts rivetted the planks instead of lashing them together. Aileach is a light boat, designed to flex in waves, and with her shallow draft she can negotiate shallow channels and be hauled up beaches out of the reach of weather."

http://www.galleyaileach.co.uk/index...d=27&Itemid=51

Pericles