[2] The valley’s name, French for "without worry," comes from the Sanssouci Palace built by the Prussian monarch Frederick the Great in Potsdam, Germany.
Sans Souci Valley used to be the easiest walking route connecting Mission Dolores and the Presidio.
[3] Hubert Howe Bancroft's History of California, evaluates an assertion by Mariano Vallejo (in Vallejo's Discurso Histórico of October 8, 1876) that the former "Lake Dolores" (or "Laguna de los Dolores") was located "in Sans Souci Valley, north of the Mission".
Research by Christopher Richard has since shown that Lake Dolores was one and the same as the wide area of Mission Creek.
[5] Research by Joel Pomerantz has shown that other vernal lakes did exist at the location in Sans Souci Valley described by Vallejo.