At Persepolis he certainly erected one very important building; and it is on the whole most probable that he designed--if he did not live to execute--the Chehl Minor itself--the chief of the magnificent structures upon the great central platform.

The massive platform itself, with its grand and stately steps, is certainly of his erection, for it is inscribed with his name.

He gave his works all the solidity and strength that is derivable from the use of huge blocks of a good hard material.

He set the example of ornamenting the stepped approached to a palace with elaborate bas-reliefs.

He designed and caused to be constructed in his own lifetime the rock-tomb at Nakhsh-i-Rustam, in which his remains were afterwards laid.