What is "anathalon"

Anathalon (or Anatalius, Anatolius, , Byzantine Greek: Ανατόλιος) was the first recorded Bishop of Milan and lived at the end 2nd-century or early 3rd-century. He is honoured as a Saint in the Catholic Church and his feast day is on September 25 in Milan. A late tradition made him the first bishop of Brescia where his feast day is celebrated on September 24.