Historical clue formulations

• LIII doubled — 2015-07-08
• Early second-century year — 2013-04-17
• Early second-century year — 2010-08-11
• 106, to Trajan — 2009-01-05
• Early second-century date — 2003-10-25
• Year Dacia was captured by Trajan — 2001-04-07
• 106, to Caesar — 1998-08-25
• Year Trajan conquered Dacia — 1997-12-18
• Year of Trajan's victory over Dacia — 1994-08-26