Seleucid era
...that the Seleucid era was a system of numbering years from the return of Seleucus I Nicator to Babylon in 312 BC?
...that the <b id="mwBLM"><a href="./Seleucid_era" id="mwBLQ" rel="mw:WikiLink" title="Seleucid era">Seleucid era</a></b> was a system of numbering years from the return of <a href="./Seleucus_I_Nicator" id="mwBLU" rel="mw:WikiLink" title="Seleucus I Nicator">Seleucus I Nicator</a> to <a href="./Babylon" id="mwBLY" rel="mw:WikiLink" title="Babylon">Babylon</a> in <a href="./312_BC" id="mwBLc" rel="mw:WikiLink" title="312 BC">312 BC</a>?