Unidentified ancient coin (East Rome or Byzantic or similar?) [solved]

Good evening, 

would please somebody help me indentifying a coin with the following characteristics:

Material: Bronze

Diameter: 16 mm

Weight: 3,07 g

Averse: Head (of ruler?) to left

Reverse: large A above of a  quadrtic unidentified object; attached P (half circle) to the right leg of the A, at the right side of the A the letters O and E (or Ξ?)

For more information plese see the attched pictures.

Your help and information is highly appreciated.

Thanks in advanced

M.

.

Probably from the Arcadian League: https://en.numista.com/catalogue/index.php?e=arkadian_league&r=&st=1-2&cat=y&im1=&im2=&ru=&ie=&ca=3&no=&v=&a=&dg=&i=&b=&m=np&f=&t=&t2=&w=&mt=&u=&g=&c=&wi=&sw=

Hi, 

Yes Arcadia mint Megalopolis

Legend : ΘE  AR

https://www.acsearch.info/search.html?id=4244875 

Thanks v.m. your suggestion and response. Seems likes this is what I looked for. 

Very helpful, thank you both.

Regards

M.