1st century: Aeolipile invented by Hero of Alexandria Encyclopaedia Britannica
1712: The first Newcomen engine is constructed in Cornwall, first successful widespread application of steam power Graces Guide
1776: Watt beam engine introduced commercially, first successful reciprocating steam engine, operates factories from it's flywheel Encyclopaedia Britannica
1829: Stephenson’s Rocket wins rainhill trials, proving the capabilities of steam locomotives American Rails
1849: George Henry Corliss invents the Corliss engine, built using multiple valves with extreme efficiency American Society of Mechanical Engineers
1866: Auguste Mouchout uses a parabolic trough to producе steam for the first solar steam engine Aalborg CSP Denmark
1881: First hydroelectric power station opens at Niagara Falls Edison Tech Center
1884: Compound steam turbine invented by Sir Charles Parsons, known for its simplicity, and abilities American Society of Mechanical Engineers
1904: Natural gas used for central heating in London, leading the way to it's use in power generation Power Engineering and Electric Light & Power
1954: USS Nautilus first nuclear vessel launched USS Nautilus Submarine Force Museum
Despite usually going hand in hand, the history of boilers and engines is separate, though they come together early on.
Steam has been in use for thousands of years, mainly for cooking and brewing. The first ever realization of steam power was by the ancient Romans.
The first boiler predecessors were made in England, the first was basically a large brewers kettle, and the steam powering the engine pumping water from the mines.