 In 1828, the Principality of Monaco and the Kingdom of Piedmont-Sardinia established a physical border with 91 boundary stones, each numbered 1 to 91, running along the border from present-day Fontvieille to Menton-Garavan.Prior to 1848, the Principality of Monaco included the villages of Roquebrune, Monti, Garavan and Menton.Of the original 91 boundary stones only 12 remain