The principality was reestablished in 1814 under the Grimaldis, only to be designated a protectorate of the Kingdom of Sardinia by the Congress of Vienna in 1815. Monaco remained in this position until 1860 when, by the Treaty of Turin, the Sardinian forces pulled out of the principality; the surrounding County of Nice (as well as Savoy) was ceded to France. Monaco became a French protectorate once again.