The modern neighbourhood of Ayvansaray occupies the ground of what was once Blachernae — in Greek, *Vlachérnai* — the imperial quarter at the northwest corner of Constantinople's walled circuit. It was here that the Byzantine emperors retreated when the Great Palace on the Marmara shore became too exposed or too decayed to inhabit. Alexios I Komnenos expanded the Blachernae complex in the late 11th and early 12th centuries, and later emperors added to it until it became the primary imperial residence in the final centuries of Byzantine rule.

The palace itself has vanished almost completely, absorbed by time and subsequent construction. What remains is the Palace of the Porphyrogenitus — also known as Tekfur Palace — a remarkable late Byzantine ruin that still stands to three stories, its brick-and-stone banded façade visible from a distance. It is one of the very few secular Byzantine buildings to survive above ground in Istanbul, and it stands in Ayvansaray as a remnant of the imperial grandeur that once defined this corner of the city.

The Theodosian Land Walls — built in the 5th century under the Emperor Theodosius II and extended over the following centuries — trace their final descent through Ayvansaray before meeting the Golden Horn. Here, three huge polygonal towers mark the terminus of the land defenses, where they connected to the sea walls that ran along the Horn's southern shore. For over a thousand years, this junction was one of the most strategically critical points in the Mediterranean world: the place where the landward and seaward defenses of Constantinople joined.

Just inside this stretch of the walls is a small cemetery attached to the shrine of Ebu Şeybet-ül Hudri. According to tradition, several companions of the Prophet Muhammad are buried here, including Toklu İbrahim Dede, believed to have taken part in the Ottoman siege that ended with the fall of Constantinople in 1453. The cemetery is a place of quiet and significance, tucked against ancient walls, its headstones shaded by trees that have grown up among the remnants of the city's oldest defenses.

Ayvansaray's monuments tell the overlapping history of a city that changed hands and religions without entirely shedding what came before. The Mosque of Atik Mustafa Pasha was once thought to be the Byzantine church of Sts Peter and Mark — the conversion left the building's bones largely intact, and the debate over its original identity continued for centuries. The Mosque of Kazasker İvaz Efendi stands nearby, and the small church of St. Mary of Blachernae — built over an *ayazma*, a sacred holy spring — survives with a particularly attractive garden around it, still used by Istanbul's small Greek Orthodox community.

These buildings occupy the same few streets, palimpsests of devotion in different languages and faiths, each generation building on and around what the previous one left standing. The pattern is common across Istanbul, but in Ayvansaray — where the Byzantine, Ottoman, and modern city all converge at the corner of the old walls — it is especially concentrated.

Home to roughly 15,747 residents as of the 2022 census, Ayvansaray sits between Balat to the south and Eyüpsultan to the west along the Golden Horn shore. The Golden Horn ferry stops here, connecting it to Üsküdar and Karaköy and Eyüp. The T5 tram skirts the neighbourhood, linking it to the Alibeyköy bus terminal and points beyond.

The area is residential and relatively quiet, the daily business of a working Istanbul neighbourhood carried on in the shadow of extraordinary history. During World War I, British bombing of Istanbul in 1918 caused damage here, a reminder that the walls of Constantinople could not protect against aerial attack. The walls still stand, however, and the neighbourhood still occupies the ground they were built to defend. In Ayvansaray, the ordinary and the ancient coexist with the ease of long familiarity.