The fundamental principles of hydrostatics were first given by Archimedes in his work H8364;pi rwv o ovpEvwv, or De its quae vehuntur in humido, about 250 B.C., and were afterwards applied to experiments by Marino Ghetaldi (1566-1627) in his Promotus Archimedes (1603).
Among more eminent Genoese cartographers are Joannes da Carignano 1344), Petrus Vesconte, who worked in 1311 and 1327, and is the draughtsman of the maps illustrating Marino Sanuto's Liber secretorum fidelium crucis, which was to have roused Christendom to engage in another crusade (figs.
By his consummate generalship and the matchless endurance of his men the pursuers were evaded and San Marino reached, though with a sadly diminished force.
This was seized upon as a pretext for violent anti-clerical demonstrations all over Italy and for brutal and unprovoked attacks on unoffending priests; at Spezia a church was set on fire and another dismantled, at Marino Cardinal Merry del Val was attacked by a gang of hooligans, and at Rome the violence of the teppisti reached such a pitch as to provoke reaction on the part of all respectable people, and some of the aggressors were very roughly handled.
Calendario was an accomplice in the conspiracy of Marino Faliero, and was executed together with the doge in 1355.
The Secreta fidelium Crucis of Marino Sanudo, a history of the Crusades written by a Venetian noble between 1306 and 1321, is also of value, particularly for the Crusade of Frederick II.
The only Latin countries in which conflict has not arisen appear to be the principality of Andorra and the republic of San Marino (Giron y Areas, SituaciOn juridica de la Iglesia Catolica, Madrid, 1905, p. 173 et seq.).
Semi-sovereign states, such as San Marino or Egypt, may make conventions upon topics within their limited competence.
It illustrates Marino Sanuto's Secreta fidelium crucis, in which its author vainly appeals to Christendom to undertake another crusade.
Restorations have been given by Marino Ghetaldi, by Hugo d'Omerique (Geometrical Analysis, Cadiz, 1698), and (the best) by Samuel Horsley (1770).