The string quartet dates from at least the 1750s, with the works of Franz Xaver Richter, Luigi Boccherini, and early Haydn.
It's actually fairly hard to pin down, though. Two violins, viola, and cello is also the standard string section of an orchestra, so how do we know something was written for just four players and not for an ensemble of varying numbers?
By the time we get to Haydn's mature quartets it is obvious--it would sound silly for a string orchestra to play these soloistic parts. But in his op. 1, there isn't that distinction. In fact, there are optional wind parts for some of the op. 1 quartets, which leads us to think they may also have been performed as divertimentos or even as small symphonies.
The Guarneri Quartet was an American string quartet founded in 1964 and disbanded in 2009.
nuno flores string quartet or corvonuno string quartet
Miami String Quartet was created in 1988.
Lindsay String Quartet was created in 1966.
Lindsay String Quartet ended in 2005.
Oslo String Quartet was created in 1991.
Berkshire String Quartet was created in 1916.
Brentano String Quartet was created in 1992.
Dubois String Quartet was created in 1910.
Dubois String Quartet ended in 1938.
London String Quartet was created in 1908.
Conservatory String Quartet ended in 1946.