A dreadnought is a modern all-big-gun (12" guns or larger) battleship. Named for HMS Dreadnought, launched in 1905.
Battleships have been in use since the 1500's, but the British Admiral Jackie Fisher was responsible for HMS Dreadnought, launched in 1905 and considered to be the first modern battleship. If the question refers to the game Battleship, it was invented by Clifford von Wickler in the early 1900's, and first marketed by the toy company Milton Bradley in 1943.
Modern steel battleships, as people know them today came out in the 1880s. The only true modern steel battleship fleet sea battle took place on 27 May 1905 in the Tsushima Strait. No decisive battleship fleet actions have ever occurred since that naval engagement.
Robert Hooke
Rober Hooke
At the turn of the 20th century, if a nation didn't have a modern steel battleship (fleet), it wasn't considered a "civilized country." Since Midway (WWII), if a country doesn't have an aircraft carrier...it's not a major power.
1906
chuck cleveland norris
It was an ACR-1 or modern battleship when it was ordered in 1886.
It was the Pennsylvania State Police.
Charles BABBAGE invented a prototype of the modern computer.
It was the Pennsylvania State Police.