Somagia

This is the plural of "somagium," "summagium," and means "horse-loads." It is a word frequently found in documents relating to agrarian matters, and may signify the load packed upon the horse's back (whence the name "sumpter-horse"), or in a cart drawn by a horse. MR. SANSOM will find a full explanation of the derivatives of its root, "sagma," at p. 50., vol. vii., of Ducange.