Thongor and the Wizard of Lemuria, by Lin Carter (epub/Kindle)

Thongor of Valkarth -- mightiest warrior of the ancient continent of Lemuria, before the dawn of history -- launches into his saga with this rousing adventure of swordplay and sorcery. The ancient dragon kings have deemed the hour right to regain their dominance over Earth -- and only Thongor and his companions, aided by the science and magic of the wizard Sharajsha, stand between mankind and the night of doom!

The first of the Thongor sword & sorcery series, "Thongor and the Wizard of Lemuria" was originally titled "The Wizard of Lemuria." This is the author's 1969 revised and expanded text.