Waag on Nieuwmarkt was built as a city gate and later transformed into a weigh house. The numerous descriptions of the history of the building are nearly exclusively based on written sources. Building-historical research was lacking. On the basis of a memorial stone with the year 1488 it was assumed that the gate had been built in connection with the construction of the Amsterdam city wall during the eighties and nineties of the fi fteenth century. However, a further search in the records,

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... ing-historical research, and typological research provided new views on the actual construction date of St Anthonispoort, the various phases in which it proves to have been built, and on late medieval defensive works in Amsterdam. Due to the city extension of 1425, in which Geldersekade, Kloveniersburgwal and Singel were excavated, the fourteenth-century gates were no longer situated on the edge of the city and new gates were required. On the basis of sources in the records, St Anthonispoort proves to have existed in 1466, but possibly already in 1462 or 1456. The fifteenth-century city gates Haarlemmerpoort and Regulierspoort and a few brick walls also appear in records dating from before the building of the city wall. After the city fi re of 1452 a few towers were built at the urgent request of Philip the Good, but it is not clear if the fi rst appearance of St Anthonis blockhouse in 1462 is related to this work. Documents show that in 1451 the defensive importance of fourteenth-century St Olofspoort had decreased - probably because of the existence of St Anthonispoort - but that the outermost defensive works were not completely trusted yet. St Anthonispoort consists of a main gate and a front gate. There are differences between the lower part and the upper part of the main gate. An abrupt rejuvenation took place and the brickwork below differs from the brickwork above as regards the existence of string courses, bond, colour and probably also brick formats. The presence of remains of battlements in the transitions of t [...]