Pierre Yves Kéralum OMI (1817–1872) was a French-born Catholic missionary and member of the Missionary Oblates of Mary Immaculate. He served in South Texas from 1853 to 1872, traveling long distances on horseback to minister to Catholics living on isolated ranches along the Rio Grande. He was also an architect who designed many buildings in the area, including the Immaculate Conception Cathedral in Brownsville, Texas.

La Lomita Chapel is a historic Catholic chapel in Mission, Texas. It was once an important site for the Cavalry of Christ, a group of priests who traveled long distances on horseback to minister to Catholics living on isolated ranches along the Rio Grande.