[Seve82]

There are plenty of deities in discworld lore to make pretenders from.

Cohen the barbarian as national hero or perhaps his silver horde with him on lead as national summon?

And as ppl who have red books know Ankh Morpork really doesn't need army to defend it as all conquerors will after entering town unopposed be assimilated to general populace or just throw towel in matter of days/weeks without much of fuzz.