Organization of remains
Merv consists of a few discrete walled cities very near to each other constructed on uninhabited land by builders of different eras, used, and then abandoned and never rebuilt. Four walled cities correspond to the chief periods of Merv's importance: the oldest, Erkgala, corresponds to Achaemenid Merv, the smallest of the three. Gäwürgala (also known as Gyaur Gala), which surrounds Erkgala, comprises the Hellenistic and Sassanian metropolis and also served as an industrial suburb to the Abbasid/Seljuk city, Soltangala—by far the largest of the three. The smaller Timurid city was founded a short distance to the south and is now called Abdyllahangala. Other ancient buildings are scattered between and around these four cities; all the sites are preserved in the "Ancient Merv Archaeological Park" just north of the modern village of Baýramaly and 30 kilometres (19 mi) east of the large Soviet-built city of Mary.
Erk Gala (from Persian, "the citadel fort") is the oldest part of the city of Merv complex. Built in the 7th century BC, Erk Gala was built as a Persian Style fortress controlling the oasis on the Murghab River. The Erk Gala fortress later served as the acropolis for the Hellenistic city and later the Arc of the Islamic city.
The foundation of Gäwürgala (Turkmen from the Persian "Gabr Qala", "Fortress of the Zoroastrians") occurred in the early Hellenistic era under the rule of the Seleucid king Antiochus I. The city was continuously inhabited under a series of Hellenistic rulers, by the Parthians, and then under the Sassanids, who made it the capital of a satrapy. Gäwürgala was the capital of the Umayyad province of Khurasan and grew in importance as Khurasan became the most loyally Muslim part of the Iranian world during Islam's first two centuries.
Gäwürgala's most visible remaining structures are its defensive installations. Three walls, one built atop the next, are in evidence. A Seleucid wall, graduated in the interior and straight on the exterior, forms a platform for the second, larger wall, built of mudbricks and stepped on the interior. The form of this wall is like other Hellenistic fortresses found in Anatolia, though this is unique for being made of mudbrick instead of stone. The third wall is possibly Sassanian and is built of larger bricks. Surrounding the wall were a variety of pottery sherds, particularly Parthian ones. The size of these fortifications is evidence of Merv's importance during the pre-Islamic era; no pre-Islamic fortifications of comparable size have been found anywhere in the Garagum. Gäwürgala is also important for the vast amount of numismatic evidence it has revealed; an unbroken series of Sassanian coins has been found there, hinting the extraordinary political stability of this period. Even after the foundation of Soltangala by Abu Muslim at the start of the Abbasid dynasty, Gäwürgala persisted as a suburb of the larger Soltangala. In Gäwürgala are concentrated many Abbasid-era "industrial" buildings: pottery kilns, steel, iron and copper-working workshops and so on. A well-preserved pottery kiln has an intact vaulted arch support and a square firepit. Gäwürgala seems to have been the craftsmen's quarters throughout the Abbasid and pre-Seljuk periods.
Soltangala (from "Sultan Qala", the sultan's fortress) is by far the largest of Merv's cities. Textual sources establish it was Abu Muslim, the leader of the Abbasid rebellion, who symbolised the beginning of the new Caliphate by commissioning monumental structures to the west of the Gäwürgala walls, in what then became Soltangala. The area was quickly walled and became the core of medieval Merv; the many Abbasid-era köshks (fortified building) discovered in and outside Soltangala attest to the centuries of prosperity which followed. Kushks (Persian, Kushk, "pavilion", "kiosk"), which comprise the chief remains of Abbasid Merv, are a building type unique to Central Asia during this period. A kind of semi-fortified two-story palace, whose corrugated walls give it a unique and striking appearance, köshks were the residences of Merv's elite. The second storey of these structures comprised living quarters; the first storey may have been used for storage. Parapets lined the roof, which was often used for living quarters as well. Merv's largest and best-preserved Abbasid köşk is the Greater Gyzgala (Turkmen, "maiden's fortress"), located just outside Soltangala's western wall; this structure consisted of 17 rooms surrounding a central courtyard. The nearby Lesser Gyzgala had extraordinarily thick walls with deep corrugations, as well as multiple interior stairways leading to second storey living quarters. All of Merv's kushks are in precarious states of preservation.
However, the most important of Soltangala's surviving buildings are Seljuq constructions. Seljuq leader Toghrul's conquest of Merv in 1037 revitalised the city; under his descendants, especially Sanjar, who made it his residence, Merv found itself at the centre of a large multicultural empire.
Evidence of this prosperity is found throughout the Soltangala. Many of these buildings are concentrated in Soltangala's citadel, the Shahryar Ark (Persian, "the Sovereign's citadel"), is on its east side. In the centre of the Sharhryar Ark is the Seljuk palace, probably built by Sanjar. The surviving mud brick walls lead to the conclusion that this palace, though relatively small, was composed of tall, single-storey rooms surrounding a central court along with four axial iwans at the entrance to each side. Low areas nearby seem to indicate a large garden, which included an artificial lake; similar gardens were found in other Central Asian palaces. Any remnants of interior or exterior decoration have been lost because of erosion or theft.
Another notable Seljuk structure within the Shahryar Ark is the kepderihana (from the Persian, "Kaftar Khaneh", or "pigeon house", i.e., the columbarium). This mysterious building, among the best-preserved in the whole Merv oasis, comprises one long and narrow windowless room with many tiers of niches across the walls. Some sources Believe the kepter khana (there are more elsewhere in Merv and Central Asia) was a pigeon roost used to raise pigeons, to collect their dung, which was used in growing the melons for which Merv was famous. Others see the kepderihanas as libraries or treasuries, because of their location in high status areas next to important structures.
The best-preserved of all the structures in Merv is the 12th-century mausoleum of Sultan Sanjar, also in Sultan Gala. It is the largest of Seljuk mausoleums and is also the first dated mosque-mausoleum complex, a form which was later to become common. It is square, 27 metres (89 ft) per side, with two entrances on opposite sides; a large central dome supported by an octagonal system of ribs and arches covers the interior (Ettinghausen, 270). The dome's exterior was turquoise, and its height made it imposing; it was said that approaching caravans could see the mausoleum while still a day's march from the city. The mausoleum's decoration, in typical early Seljuk style, was conservative, with interior stucco work and geometric brick decoration, now mainly lost, on the outside. Except for the recently "reconstructed" exterior decoration, the largely intact mausoleum remains just as it was in the 12th century.
A final set of Seljuq remains are the walls of the Soltangala. These fortifications, which largely remain, began as eight-to-nine-metre-high (26 to 30 ft) mud brick structures, inside of which were chambers for defenders to shoot arrows from. There were horseshoe-shaped towers every 15 to 35 metres (49 to 115 ft). These walls, however, did not prove to be effective because they were not of adequate thickness to withstand catapults and other artillery. By the mid-12th century, the galleries were filled in, and the wall was greatly strengthened. A secondary, smaller wall was built in front of the Soltangala's main wall, and finally the medieval city's suburbs—known today as Isgendergala—were enclosed by a 5-metre-thick (16 ft) wall. The three walls held off the Mongol army for at least one of its offensives, before ultimately succumbing in 1221.
Many ceramics have been recovered from the Abbasid and Seljuk eras, primarily from Gäwürgala, the city walls of Soltangala, and the Shahryar Ark. The Gäwürgala ware was primarily late Abbasid and consisted primarily of red slip-painted bowls with geometric designs. The pottery recovered from the Sultan Gala walls is dominated by 11th to 12th-century colour-splashed yellow and green pottery, similar to contemporary styles common in Nishapur. Turquoise and black bowls were discovered in the Shahryar Ark palace, as well as a deposit of Mongol-style pottery, perhaps related to the city's unsuccessful re-foundation under the Il-khans. Also from this era, is a ceramic mask used for decorating walls found among the ruins of what is believed—not without controversy—to be a Mongol-built Buddhist temple in the southern suburbs of Sultan Gala.
Shaim Kala was built in the 7th century AD. Shaim Kala was a self-contained walled city intended to relieve over-crowding, and to deal with the religious and political discontent of the newly arrived peoples.
Abdyllahangala is the post medieval Timurid era city to the south of the main complex.
