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.
Knights of Honor was created in 1873.
Sacramento Knights was created in 1993.
Kongsvinger Knights was created in 1961.
Brutal Knights was created in 2006.
British Knights was created in 1980.
Brooklyn Knights was created in 1999.
Toolroom Knights was created in 2009.
Northern Knights was created in 1992.
Knights of Xentar was created in 1991.
Knights of Pythias was created in 1864.