Jerónimo de Ayanz y Beaumont

Jerónimo de Ayanz y Beaumont (1553 – 23 March 1613) was a Spanish soldier, painter, astronomer, musician and inventor. He pioneered the use and design of the steam engine, as well as mining ventilation systems, improved scientific instrumentation, developed windmills and new types of furnaces for metallurgical, industrial, military, and even domestic operations. He invented a diving bell, patented an immersion suit tested before the court of Felipe III in Pisuerga, on August 2, 1602, and designed a submarine.