Imperial Society of Knights Bachelor was created in 1908.
Imperial Society of Teachers of Dancing was created in 1904.
Feudalism is the structure of the government and part of the society. It is not a separate thing so in asking this question you are asking about a system that the knights were part of and created. Knights were nobles and a different class of people and were created because of feudalism.
Northern Knights was created in 1992.
Knights of Xentar was created in 1991.
Knights of Pythias was created in 1864.
Newcastle Knights was created in 1988.
Trojan Knights was created in 1921.
Marching Knights was created in 1979.
Irymple Knights was created in 1978.
Franken Knights was created in 1983.
Knights of Honor was created in 1873.
The Honour of the Knights was created in 2009.