of Drop
imp. & p. p. of Drop, v.
Source: Webster's dictionaryMrs. Montagu has dropt me. Now, Sir, there are people whom one should like very well to drop, but would not wish to be dropped by. Samuel Johnson
In addition to Chasseneuil near Poitiers, scholars have suggested that Louis may have been born at Casseneuil (Lot et Garonne) or at Casseuil on the Garonne near La Réole, where the Dropt flows into the Garonne. Source: Internet