Within the church, in the lower choir, are the stone tombs of Vasco da Gama (1468–1523), and of the great poet and chronicler of the Age of Discoveries, Luís de Camões (1527–1580). Both tombs were sculpted by the 19th-century sculptor Costa Mota in a harmonious neo-Manueline style. The mortal remains of both were transferred to these tombs in 1880. Work on the vast square cloister (55 × 55 m) of the monastery was begun by Boitac. He built the groin vaults with wide arches and windows with tracery resting on delicate mullions. Juan de Castilho finished the construction by giving the lower storey a classical overlay and building a more recessed upper storey. The construction of such a cloister was a novelty at the time. Castilho changed the original round columns of Boitac into rectangular ones, and embellished it with Plateresque-style ornamentation. Each wing consists of six bays with tracery vaults. The four inner bays rest on massive buttresses, forming broad arcades. The corner bays are linked by a diagonal arched construction and show the richly decorated corner pillars. The cloister had a religious function as well as a representative function by its decorative ornamentation and the dynastic symbolic motives, such as the armillarium, coat-of-arms, and the cross from the Order of Christ, showing the growing world power of Portugal. The inside walls of the cloister have a wealth of Manueline motives with nautical elements, in addition to European, Moorish and Eastern motifs. The round arches and the horizontal structure are clearly in line with the Renaissance architectural style, while at the same time there is also a relationship with Spanish architecture. The decorations on the outer walls of the inner courtyard were made in Plateresco style by Castilho: the arcades include traceried arches that give the construction a filigree aspect. In one of these arcades is the sober tomb of the poet Fernando Pessoa, while several other tombs in the chapterhouse contain the remains of the poet and playwright Almeida Garrett (1799–1854), the writer-historian Alexandre Herculano (1810–1877), former presidents Teófilo Braga (1843–1924) and Óscar Carmona (1869–1951).