The round numbers employed by those authors, and by the Greek geographers generally, who borrow from them, serve to show that their knowledge was merely collected from rumours; and that in all probability they were indebted for their information to the stories of Arabian or Hindu sailors returning from the Eastern seas. Pliny learned from the Singhalese Ambassador who visited Rome in the reign of Claudius, that the breadth of Ceylon was 10,000 stadia from west to east; and Ptolemy fully developed the idea of his predecessors, that it lay opposite to the "Cinnamon Land," and assigned to it a length from north to south of nearly _fifteen degrees_, with a breadth of _eleven_, an exaggeration of the truth nearly twenty-fold.[1] Agathemerus copies Ptolemy; and the plain and sensible author of the "Periplus" (attributed to Arrian), still labouring with the delusion of the magnitude of Ceylon, makes it stretch almost to the opposite coast of Africa.[2] [Footnote 1: PTOLEMY, lib. vii. c. 4.] [Footnote 2: ARRIAN, _Periplus_, p. 35. Marcianus Heracleota (whose Periplus has been reprinted by HUDSON, in the same collection from which I have made the reference to that of Arrian) gives to Ceylon a length of 9500 stadia with a breadth of 7500.--MAR. HER. p. 26.] These extravagant ideas of the magnitude of Ceylon were not entirely removed till many centuries later. The Arabian geographers, Massoudi, Edrisi, and Aboulfeda, had no accurate data by which to correct the errors of their Greek predecessors. The maps of the fourteenth and fifteenth centuries repeated their distortions[1]; and Marco Polo, in the fourteenth century, who gives the island the usual exaggerated dimensions, yet informs us that it is now but one half the size it had been at a former period, the rest having been engulfed by the sea.[2] [Footnote 1: For an account of Ceylon as it is figured in the _Mappe-mondes_ of the Middle Ages, see the _Essai_ of the VICOMTE DE SANTAREM, _Sur la Cosmographie et Cartographie_, tom. iii. p. 335, &c.] [Footnote 2: MARCO POLO, p. 2, c. 148. A later authority than Marco Polo, PORCACCHI, in his _Isolario_, or "Description of the most celebrated Islands in the World," which was published at Venice in A.D. 1576, laments his inability even at that time to obtain any authentic information as to the boundaries and dimensions of Ceylon; and, relying on the representations of the Moors, who then carried on an active trade around its coasts, he describes it as lying under the equinoctial line, and possessing a circuit of 2100 miles. "Ella gira di circuito, secondo il calcole fatto da Mori, che modernamente l'hanno nauigato d'ogn'intorno due mila et cento miglia et corre mæstro e sirocco; et per il mezo d'essa passa la linea equinottiale et è el principio del primo clima al terzo paralello."--_L'Isole piu Famose del Monde, descritte da_ THOMASO PORCACCHI, lib. iii. p. 30.]