<P> Capital of amorphous form surmounting a cluster of shafts . The figurative carving shows a winged devil directing Herod to slaughter the Innocents . Monastery of San Juan de Duero, Soria, Spain </P> <P> The majority of buildings have wooden roofs, generally of a simple truss, tie beam or king post form . In the case of trussed rafter roofs, they are sometimes lined with wooden ceilings in three sections like those that survive at Ely and Peterborough cathedrals in England . In churches, typically the aisles are vaulted, but the nave is roofed with timber, as is the case at both Peterborough and Ely . In Italy where open wooden roofs are common, and tie beams frequently occur in conjunction with vaults, the timbers have often been decorated as at San Miniato al Monte, Florence . </P> <P> Vaults of stone or brick took on several different forms and showed marked development during the period, evolving into the pointed ribbed arch characteristic of Gothic architecture . </P> <P> The simplest type of vaulted roof is the barrel vault in which a single arched surface extends from wall to wall, the length of the space to be vaulted, for example, the nave of a church . An important example, which retains Medieval paintings, is the vault of Saint - Savin - sur - Gartempe, France, of the early 12th century . However, the barrel vault generally required the support of solid walls, or walls in which the windows were very small . </P>

Which of the following systems allowed for the adoption of light in a romanesque church