Sublime Porte
The gate, then the building, then the entire Ottoman government: the address European diplomats meant when they said they were negotiating with Istanbul.
When a nineteenth-century foreign minister said he had delivered a note to the Sublime Porte, he meant the Ottoman government, and he was using a metonym so old that most people using it had stopped noticing. The Porte was a literal gate: Bab-i Ali, the high or sublime gate, the entrance to the grand vizier's official compound in Istanbul. Petitions were heard at the gate, justice was dispensed at the gate, and ambassadors presented themselves at the gate. Over time the name migrated from the doorway to the offices behind it, and from the offices to the state itself.
From a gate to a government
Early Ottoman power sat inside Topkapi Palace, where the sultan ruled personally and the imperial council met under his eye. As the sultanate withdrew from day to day government after the sixteenth century, business moved to the grand vizier's residence, the Pasha Kapisi, which by the eighteenth century was permanently established as the seat of administration. The distinction became institutional. The palace held sovereignty and legitimacy. The Porte held the ministries, the archives, the correspondence, and the professional men who ran an empire stretching from the Danube to the Persian Gulf.
The nineteenth century turned that arrangement into something recognizably modern. Ottoman diplomacy had traditionally been handled by the chief scribe and by translators drawn from the Greek families of the Phanar district. After the Greek revolt of 1821 made those families politically impossible, the empire built a Translation Office to train Muslim officials in French, and it became the incubator of an entire reforming class. Out of it came a foreign ministry, permanent embassies in European capitals, and the statesmen who drove the Tanzimat reforms of 1839 to 1876. For decades the Porte, not the palace, was where the empire was actually governed and where its modernization was designed.
The Porte as a target
That made it worth capturing. Sultan Abdulhamid II reversed the balance after 1878, suspending the constitution and pulling power back into his own palace at Yildiz, where he ran the empire through a personal secretariat and an enormous intelligence apparatus while the Porte's ministers waited for instructions. The Young Turk revolution of 1908 forced the constitution back and returned initiative to the ministries.
The most literal illustration of what the Porte had become came on January 23, 1913. With the empire losing the First Balkan War and the cabinet preparing to concede Edirne, a group of officers of the Committee of Union and Progress led by Enver and Talat walked into the Sublime Porte, shot the minister of war dead in the corridor, and forced the grand vizier to write out his resignation at gunpoint. The raid on the Sublime Porte put the Three Pashas in control of the empire and, eighteen months later, took it into the First World War on Germany's side. A coup carried out by seizing a building says something exact about where power was understood to live.
Afterward
The Porte died with the empire. The sultanate was abolished in November 1922, the Republic of Turkey was declared in 1923 after the Treaty of Lausanne with its capital moved inland to Ankara, and the ministries of the new state were built there deliberately away from the old imperial center. The building at the gate still stands in Istanbul, housing the governor's offices of the province.
The phrase survives as a lesson in how states get named. Foreign chancelleries needed shorthand for a government whose sovereign was formally absolute but practically detached, and they settled on the door where the work was done. It is the same instinct that produces the White House, the Kremlin, Whitehall, and Beijing. Where the paperwork is signed tells you more about a state than where the crown sits.