The county boundary was changed in 1857.

El Dorado was so named from the fancied resemblance of its history to the wonderful country pretended to be discovered by Pizarro, and celebrated by his chronicler, Orellana.

It was in this country that gold was first discov ered, whence the application of the name.

Coloma was made the county seat, but it was removed to Placerville in 1856.

The boundary of the county was changed in 1855 and 1863.