From 1639 â `` 1706 , it was known as Ã -- rgÃ Ã ( Mongolian : Ó Ñ Ð Ó Ó , residence ) , and from 1706 â `` 1911 as Ikh KhÃ 1\/4 ree ( Mongolian : Ð Ñ From 1639 â `` 1706 , it was known as Ã -- rgÃ Ã ( also spelled Urga ) , and from 1706 â `` 1911 as Ikh KhÃ 1\/4 ree ( Mongolian : Ð Ñ