Sepolcro, a circular church with ornamentation in brick and an imitation of opus reticulatum, should probably be attributed to the 6th or 7th centuries.
All that is left of it is the core of opus incerturn.
In the interior the effect is gained by broad masses of chromatic decoration in marble-veneer and mosaics on a gold ground to cover the walls and vaults, and by elaborate pavements of opus sectile and opus Alexandrinum.
He wrote abundantly in prison; his magnum opus was a history of Sweden in Latin, but he has also left, in Swedish, two important rhyme-chronicles.
In the neighbourhood are the remains of several ancient villas, and along the Via Appia still stands an ancient wall of opus reticulatum, with an inscription, in large letters, of one Varronianus, the letters being at intervals of 25 ft.
The pavement of the triple choir, though much restored, is a very magnificent specimen of marble and porphyry mosaic in opus alexandrinum, with signs of Arab influence in its main lines.
Pietro e Paolo and the adjoining houses are extensive substructures (in opus reticulatum and brickwork) of the 1st century A.D., belonging to a building erected by M.
But the highest developments of priestly influence are hardly separable from something of magical superstition, the opus operatum of the priest has the power of a sorcerer's spell.
Diagrams illustrating the division of the world into climata, are to be found in the opus majus of Roger Bacon (d.
While much that Herder produced after settling in Weimar has little value, he wrote also some of his best works, among others his collection of popular poetry on which he had been engaged for many years, Stimmen der Volker in Liedern (1778-1779); his translation of the Spanish romances of the Cid (1805); his celebrated work on Hebrew poetry, Vom Geist der hebrdischen Poesie (1782-1783); and his opus magnum, the Ideen zur Philosophie der Geschichte der Menschheit (1784-1791).