Along the Land Walls - Strolling Through Istanbul: The Classic Guide to the City - page 354

Emperor Theodosius II, builder of these walls; it did not disappear
until the fourteenth century.
Mevlevihane Kapısı takes its name from the tekke of Mevlevi
dervishes which once stood outside the gate. This tekke was founded
in the sixteenth century by Merkez Efendi, the son-in-law of the
Sümbül Efendi whose türbe we have seen in the courtyard of Koca
Mustafa Paşa Camii. In Byzantium this entryway was called the Gate
of Rhegium, or sometimes the Gate of the Reds, after one of the four
factions of the Hippodrome. On the south corbel of the outer gate
is the inscription which we have already mentioned, recording the
construction of the walls by Theodosius and the Prefect Constantine.
There is also an inscription on the lintel of the outer gate which reads
in part: “This tower of the Theodosian wall was restored under Justin
and Sophia, our most pious sovereigns, and by Narses, the most
glorius Spatharius and Sacellarius...” The emperor referred to here
is Justin II, nephew and successor of Justinian the Great, who ruled
from 565 till 578. The strain of his imperial duties must have been
too much for poor Justin, for he ended his days in total madness,
being pulled through the halls of the Great Palace in a toy cart.
Narses, who succeeded Belisarius as commander of Justinian's army,
conquered Totila, King of the Goths, and so saved for a time the
Western Empire. Narses later became the Byzantine ruler of Italy, the
last before the peninsula fell to the Lombards. He was perhaps the
greatest of all the eunuchs who served Byzantium.
MEVLEVİHANE KAPISI TO TOPKAPI
The line of walls extending from Mevlevihane Kapısı to Topkapı, the
next public gate, forms the centre of the long arc of walls between
the Marmara and the Golden Horn. On the seventh tower along,
where the walls extend farthest into Thrace, there is this inscription:
“Oh Christ, God, preserve thy city undisturbed and free from war.
Conquer the wrath of our enemies.”
Before reaching Topkapı we come to the Fourth Military Gate,
now walled up, and then to the wide new breach in the walls made
for the passage of Millet Caddesi. If we turn into Millet Caddesi and
walk about 300 metres we come on the right to a vast bus depot. Just