The Collector

Lord Umbacano of the Umbacano Manor in the Talos Plaza district is a collector of rare Ayleid antiquities.

As soon as you exit the Imperial Prison Sewers to from the beginning of the game, there will be an Ayleid ruin directly ahead, if you explore deep enough into the ruin, you'll find an Ancient Ayleid Statue. Take this to Lord Umbacano and he will ask that you find the other 9 to complete his collection.

I havent found anymore other than that one. So I have no idea where to find any others. The reward, however, is quite lucrative for just one statue.