He came to live at various times on the sea-shore at Kailua.

He employed everywhere workmen to cut stones, to serve, some say, in the construction of a sepulchral cave; according to others, to build a magnificent palace.
Whatever may have been their destination, the stones were admirably hewn.[18] In our days the Calvinistic missionaries have used them in the erection of the great church of Kailua, without any need of cutting them anew.

There are still seen, scattered in various places, the hewn stones of King Umi, _na pohaku kulai a Umi_.

It is natural to suppose that they used to hew these hard, and very large stones with other tools than those of Hawaiian origin.

Iron must have been known in the time of Umi, and its presence is explained by the wrecks of ships which ocean currents may have drifted ashore.