Kazimir Semenovich was an engineer of the army of the Grand Duchy of Lithuania. The author of the book on pyrotechnics and artillery "The great art of artillery" which was published in Amsterdam in 1650. The book was extremely successful in European countries. Semenovich perfected pyrotechnics of his time: he developed a new design, invented delta wings that are still in use today. He proposed a prototype of a multistage rocket that was the basis of space shuttles. He propagated the ideas of humanism.