Original: At each end of the narthex is a rather theatrical space framed by ionic columns in each of which is set and equestrian figure, Charlemagne by Cornacchini (18th century) to the south and Emperor Constantine by Bernini (1670) to the north.
Simplified: They are Charlemagne sculpted by Cornacchini (18th century) to the south and Emperor Constantine by Bernini (1670) to the north.