What comprises the octagon on which the dome of the Katholikon at Hosios Loukas rests?

The tree where the Norse gods held daily council was called

a. Ymir. b. Yggdrasil. c. Utgard. d. Norn.

Which was the leading industry of the late Middle Ages?

A. manufacture of rag paper B. the iron industry C. leather tanning D. hand-loomed textile manufacturing