St Mary's RC Chapel, with St. Joseph's Convent (Lower Arthur St & Bridge St.), attached to the west. Shown on late 19th and early 20th century OS maps (1-3) St Mary's is the principal Roman Catholic church of Derby. Completed in 1839, the work of the elder Pugin. Adjoining the church is a large convent. (4) The Convent consists of 2 wings, that on left was built in the early 19th century and that on right probably late 16th century, with later alterations. It is built from red brick and is 3 storeys high with 9 windows, formerly sashes, all replaced by modern windows. There is a recessed doorway with a moulded wood doorcase and divided door and there is a painted stone Roman Doric portico in the antis, having 2 columns and 2 pilasters, and triglyph frieze with paterae. There are plain eaves on the left-hand side, a stone-coped parapet to right wing and the roof is slate. There are modern additions at rear. (5)