Portia was discovered January 1986 in images sent back by the Voyager 2 spacecraft during its flyby of Uranus.
Very little is known about Uranus' small and fast-moving moon Portia. It is known that Portia has a diameter of 140 km, making it one of the largest of Uranus' lesser satellites. It is also known that Portia orbits Uranus in less than one Earth day.
This moon is named after Portia, the heroine of William Shakespeare's 16th century play "The Merchant of Venice." It was originally designated S/1986 U 1