The Tapa Gaccha is the largest monastic order of Svetambara Jainism.
It was founded by Acharya Jagat Chandrasuri in Vikram Samvat 1285 (1229 AD). He was given the title of "Tapa" (i.e. the meditative one) by the ruler of Mewar.
It was a branch of the Brihad Gaccha founded by Udyotan Suri.
Vijayananda Suri was responsible for reviving the wandering orders among the Svetambara monks. As a result of this reform, most Svetambara Jain monks today belong to the Tapa Gaccha.
Read more about Tapa Gaccha: Reforms, Differences Among Subsects, Sect of Tapa Gachchha