Chiesa di Sant'Anastasia Martire, Tissi

The church of Santa Anastasia is a religious building located in Tissi, a town in the historical region of Sassarese, northwestern Sardinia. Consecrated to Catholic worship, it is the seat of the parish of the same name and is part of the archdiocese of Sassari.

The church, located on the main street axis of the urban center, appears to be adjacent on the southern side to the oratory of Santa Croce.

The current layout is due to a 17th-century remodeling that distorted its floor plan: in fact, three chapels were opened on each side enclosed between strong external buttresses. To carry out this enlargement, the side walls of the building were broken through, affixing pillars to support the sub-arches of the barrel vault. The apse is preserved, behind the maximum arch leading to the altar, which at the impost of the basin has a shelled cornice.

The building originally had a longitudinal single-room plan with an apse to the southeast: the Romanesque forms now appear legible only on the exterior in the sections where the original wall face built with squared limestone ashlars is preserved.

The façade is framed by wide corner pilasters, which are welded to the scarp plinth and the small arches of the slopes, and is tripartite by pilasters that divide it into three mirrors: a horizontal arching divides it into two sectors. Both lower and upper pilasters end at the impost of the small arches. In the side mirrors is inlaid, within a circular limestone dowel, a dark trachyte cross. The portal, architraved, is surmounted by a round arch; in the lunette, which is semicircular, sloping molded cornices were inserted in the 17th century to mark a tympanum. The opening of oculi in the upper side mirrors is also ascribed to the same period. Along the sides, at the same height as the horizontal arching, runs a theory of small arches on sgucio, bullnose, or stepped corbels.

The facing, observable only in the upper section due to later interventions, is interspersed with narrow, flat pilasters and framed between wide corner pilasters.

Regarding the dating of the Romanesque building, some aspects inferable from sources and stylistic comparisons must be revealed. The title of Sancta Anastasia appears among the appurtenances of San Michele di Plaiano in 1082, along with several parish churches of now extinct villages in the contiguous territory of Ossi.