From the second half of the 19th century until the 1930s European collectors were confused by the different styles of Iznik pottery and assumed that they originated from different pottery producing centres. Although it is now believed that all the pottery was produced in İznik (or
Kütahya, see below) the earlier names associated with the different styles are still often used. In the 19th century until the 1860s all Islamic pottery was normally known as 'Persian' ware. However, between 1865 and 1872 the
Musée de Cluny in Paris acquired a collection of polychrome fritware pottery with a design that included a bright 'sealing-wax red'. As all the items in the collection had been obtained on the island of
Rhodes it was assumed, erroneously, that the pottery had been manufactured on the island and the term 'Rhodian' ware was adopted for this style. European collectors also purchased a number of pieces decorated in blue, turquoise, sage green and pale purple which were believed to originate from the town of
Damascus in Syria and became known as 'Damascus' ware. Blue and white fritware pottery became known as 'Abraham of Kutahia ware' as the decoration was similar to that on a small ewer that once formed part of the collection of
Frederick Du Cane Godman and is now in the British Museum. The ewer has an inscription in
Armenian script under the glaze on its base stating that the vessel was "in commemoration of Abraham, servant of God, of K'ot'ay [Kütahya]. In this year 959 [AD 1510]". In 1905–1907, during the construction of a new post office in the
Sirkeci district of Istanbul near the shore of the
Golden Horn, pottery fragments were unearthed that were decorated with spiral designs on a white background. As a result, pottery with similar spiral patterns became known as 'Golden Horn ware'. It was not until the 1930s that art historians fully realised that the different styles of pottery were probably all produced in Iznik. In 1957 Arthur Lane, keeper of ceramics at the
Victoria and Albert Museum, published an influential article in which he reviewed the history of pottery production in the region and proposed a series of dates. He suggested that 'Abraham of Kütahya' ware was produced from 1490 until around 1525, 'Damascus' and 'Golden Horn ware' were produced from 1525 until 1555 and 'Rhodian' ware from around 1555 until the demise of the Iznik pottery industry at the beginning of the 18th century. This chronology has been generally accepted.
İznik and Kütahya The 'Abraham of Kutahia' ewer of 1510 is not the only vessel with a possible
Kütahya origin. A damaged water bottle decorated in the 'Golden Horn' style has two
underglaze inscriptions in
Armenian script; one, dated 1529, refers to the commissioner of the vessel, Bishop Ter Martiros, the other refers to the vessel as being sent as "an object of K'ot'ays" for a monastery. Lane argued that it was unlikely that either the 'Abraham of Kutahia' ewer or the water bottle had been made in Kütahya. However, subsequent archaeological excavations in Kütahya have unearthed fragments of pots in the blue and white Iznik style that had been damaged during manufacture ('wasters') providing evidence that fritware pottery was produced in the town. The designs, materials and manufacturing technique appear to have been similar to that used in İznik. Kütahya is further from Istanbul with less easy access to the capital and was probably only a small pottery producing centre in the 16th century. Nevertheless, it is likely that some of the pottery that is currently labelled as 'Iznik' was manufactured in Kütahya. The art historian Julian Raby has written: "For the moment we have no choice but to call all Ottoman glazed pottery of the 16th and 17th centuries by the generic label 'Iznik', and to hope that in time we can learn to recognise the diagnostic features of contemporary 'Kütahya ware'."
Imperial workshops in Istanbul During the first half of the 16th century underglaze painted blue-and-white ceramics were also produced in Istanbul. A surviving account book for 1526 that records wages paid to craftsmen employed by the Ottoman court, lists a tilemaker from
Tabriz with ten assistants. The tilemaker was probably one of the craftsmen brought to Istanbul after
Selim I had temporary captured Tabriz in 1514. The tile workshops were located in the Tekfur Sarayı neighbourhood of the city near the
Palace of the Porphyrogenitus. The craftsmen are believed to have been responsible for all the tiles on the imperial buildings until the construction of the
Süleymaniye Mosque in the 1550s. Most of the tiles were decorated with coloured glazes using the
cuerda seca (dry cord) technique, but in a few cases the tiles were underglaze painted in cobalt blue and turquoise. The cuerda seca technique created a new way to glaze these tiles while not requiring the intense labor previous techniques had. These underglaze tiles were used on the revetments of the facade of the Holy Mantle Pavilion (Privy Chamber) in the grounds of the
Topkapı Palace and within the mausoleum of
Çoban Mustafa Pasha (d. 1529) in
Gebze. The most striking examples are five extremely large rectangular tiles, in length, that form part of the façade of the
Circumcision Room (Sünnet Odası) of the Topkapı Palace. Although the building dates from 1641, the tiles are believed to come from an earlier structure on the same site that was erected in 1527–1528. These large tiles are decorated with very elaborate designs that suggests the close involvement of the court designers. Although there are no surviving records detailing the output of the imperial workshops, it is likely that the potters manufacturing the blue-and-white underglaze painted tiles also made other items for the court. The art historian
Gülru Necipoğlu has suggested that an unusual gilded mosque lamp and a decorative ball that come from the
Yavuz Selim Mosque should be attributed to the imperial workshop. The lamp and ball have underglaze inscriptional bands in cobalt blue but the mosque itself is decorated only with
cuerda seca tiles. The number of tilemakers employed by the imperial workshops dwindled so that by 1566 only three remained. With the construction of the Süleymaniye Mosque, Iznik became a major center for the manufacture of underglaze tiles. ==Miletus ware (15th century)==