The Kleos (or Coif) series consists of gladiator-themed helmets that are worn as hats. It and the Dominus series were originally conceptualized by Shedletsky (known as Telamon at the time). It began with the Coif of Glory, but the most notable helmet in the series would be the The Kleos Aphthiton, which is considered to be one of the most scarce and valuable limited items on Roblox.
As of May 9, 2018, there are 5 of these helmets in the catalog. Only the two Coifs are still available as regular items, while the Kleos Aphthiton and Phóteinos are limited and the Themis is offsale.