Farthing Edward I, II ?

[Citizen H]

its been hanging around and resides in a pot of unrecognisable hammered coins, 

I have given it my best and last chance of its identification....

I have it as a Farthing, Edward I or II 

Civi Taz = City Of.....?

so not much to go on...unless anyone else happens to know ? 

all the best H"     

[Citizen H]

a better picture of the obverse side.