sentences:  One side is partially occupied by Charterhouse Square School, a small independent primary school.In July 2011, English Heritage granted Grade II listed status to the "setted" road surface in the square, which was laid down in the 1860s.In 2014 evidence of the large burial pit for plague victims dating from 1348–50, the time of the Black death, was discovered under the square by workers building the Crossrail project.