User blog comment:Hitsuji Mamoru/Servant Creation Room 2 : Guess of the Who/@comment-32599925-20170722182822/@comment-28209103-20170725145736

shouldn't anyone try to answer by now? no

then random guess, since her 4th ascension is bout unfinished Colloseum then it should be either Titus or Flavian,, probably Titus because he's the one who actually become military general in his life.. but I heard the colloseo are finished during his reign so it might be Flavius.