With the Counter Reformation initiated by the Council of Trent (1545-1563), positions hardened and a strict Catholic orthodoxy based on Scholastic philosophy was imposed. Some humanists, even moderate Catholics such as Erasmus, risked being declared heretics for their perceived criticism of the church. 
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He was also interested in artistic theory. The so-called Treatise on Painting consists of scattered remarks in the notebooks assembled and published after his death. Leonardo had himself intended to organize his notes into treatises on various subjects, but he never got around to it. In addition to his theoretical studies, he also devised machines for various practical purposes, even though these inventions normally did not progress beyond the drawings he made of them. The letter he wrote to Ludovico the Moor of Milan, recommending himself to the latter, reveals something of his own conception of his usefulness, at least to the rulers of states. What he stresses most, in listing his capabilities, is his expertise as a military engineer and deviser of weapons. He can build bridges, destroy any fortress, "contrive various and endless means of attack and defence," and so forth. In time of peace, he can construct buildings, "carry out sculpture in marble, bronze or clay, and also I can do in painting whatever can be done, as well as any other, be he who may." At the end of the letter, he commends himself to Ludovico "with all possible humility."7
Carol Hillenbrand, The Crusades: Islamic Perspectives
Eusebius compiled his work in Greek , although a Latin translation of the same work was made by Jerome about a century later.
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