The architectural character of Anglo-Saxon ecclesiastical buildings range from Celtic influenced architecture in the early period; Early Christian basilica influenced architecture; and in the later Anglo-Saxon period, an architecture characterised by pilaster-strips, blank arcading, baluster shafts and triangular headed openings. In the last decades of the Anglo-Saxon kingdom a more general Romanesque style was introduced from the Continent, as in the now built-over additions to Westminster Abbey made from 1050 onwards, already influenced by Norman style. In recent decades architectural historians have become less confident that all undocumented minor "Romanesque" features post-date the Norman Conquest. Although once common, it has been incorrect for several decades to use the plain term "Saxon" for anything Anglo-Saxon that is later than the initial period of settlement in Britain.