Seleucus BC) was an officer under Alexander the Great, he led the élite infantry, the "shield-bearers" (Hypaspistai) known as the "silvershields"- This is a roman copy of a lost greek marble now in the Louvre, Paris.
Seleukos I Nicator Tetradrachm. Seleucus I Nicator was one of the Diadochi. Having previously served as an infantry general under Alexander the Great, he eventually assumed the title of basileus and established the Seleucid Empire.
Seleucus I Nicator BCE) A leading officer of Alexander the Great's League of Corinth, took possession of Syria and became the founder of the Seleucid Empire BCE) - History of Macedonia - the ancient kingdom of Greece