Board Thread:Off-Topic/@comment-17114085-20180414193343/@comment-17114085-20180420104639

Actually according to Velehk Sain in Skyrim:

"Years back, I had to ferret away some booty nearby. We'd sunk an Imperial Galleon off the coast. Good plunder, but we needed to travel light. We stashed what we couldn't carry, and I hid it with a trick I know. I can point you in the right direction, and we'll each go our separate ways."

Galleons exist in universe. So up to 16th century ships types are canon.