The Red Fort is not actually red. Not all of it, anyway. Long stretches of its outer wall are sandstone — a colour somewhere between rust and ochre — but the original surface was lime-washed white, with painted floral panels in red, blue, and green. The British, who took the fort in 1857 and stripped most of the lime to the bare stone, are the ones who fixed the name "Red Fort" in the English imagination. Shah Jahan called it something else entirely.
The Blessed Fort
In 1639 the fifth Mughal emperor decided he had outgrown Agra. He had ruled from there for eleven years, watched the Taj Mahal go up for his late wife, and concluded that the city was too cramped to hold his court. He chose a new site on the western bank of the Yamuna, ordered the construction of a walled city around it, and named the city Shahjahanabad — Shah Jahan's town.
The palace fort at its centre he called Qila-e-Mubarak: the Blessed Fort. The name appears repeatedly in contemporary chronicles — Inayat Khan's Shah Jahan Nama, Abdul Hamid Lahori's Padshahnama. It was meant to be auspicious in the most literal sense, sealed with prayers, oriented by court astrologers. Construction began on 13 May 1638. It was inaugurated on 19 April 1648, after a decade and roughly ten million rupees — about the same as the Taj Mahal.
The architects
The fort was designed by Ustad Ahmad Lahori, the same chief architect Shah Jahan had used at the Taj. His collaborator was Ustad Hamid. Both were Persian-trained, but by this point the Mughal style had absorbed two centuries of Indian craft conventions. Inside the fort you can see them everywhere: the chhatri pavilions on the gates, the bracketed chajja eaves, the white marble inlay work using semiprecious stones (pietra dura) on the throne walls.
"If there is heaven on earth, this is it"
The fort's most quoted line is carved in Persian on the marble arches of the Diwan-i-Khas, the Hall of Private Audience:
Agar firdaus bar ru-i-zamin ast, hami ast-o hami ast-o hami ast.
If there is heaven on earth, this is it, this is it, this is it.
The line is from the 14th-century Persian poet Amir Khusrau. Shah Jahan had it inlaid above the chamber that held the Takht-e-Taus, the Peacock Throne — and he meant it about the room. The Diwan-i-Khas was the most lavishly decorated space in the empire: silver ceiling, jewelled inlays, marble columns, and at its centre the most expensive piece of furniture ever made up to that point. Heaven was an architectural claim.
The nahr-i-bahisht — the Stream of Paradise
Running through the centre of the fort, from the imperial baths in the north to the Rang Mahal in the south, Shah Jahan had a marble water channel built into the floor. He called it Nahr-i-Bahisht, the Stream of Paradise. Water was lifted from the Yamuna, filtered, and run through this channel under every important room. In summer, with the channel flowing, the temperature inside the marble pavilions dropped by ten degrees. It was air conditioning, two centuries early.
The channel is now dry. The Yamuna has shifted course away from the fort walls. But the white marble inlay of the channel is still visible in every chamber it passed through. It is one of the most quietly genius pieces of architecture in the building.
The end of the empire, in one small room
For two hundred years the fort held the Mughal court. In 1739 Nadir Shah of Persia sacked it, looted everything portable — including the Peacock Throne — and rode home. In 1788 the Rohilla chief Ghulam Qadir blinded the emperor Shah Alam II at the throne. In 1857, after the uprising of that May, the British retook the fort, demolished perhaps two-thirds of its inner palaces to build barracks, and held the last emperor — Bahadur Shah Zafar, 82 years old, poet, calligrapher — for trial inside his own throne room.
The room is still there. Plain, plastered, no inscriptions, no carvings. The court was held by a British military commission for forty days in early 1858. Zafar was found guilty of treason, deposed, and exiled to Rangoon, where he died four years later. His sons were shot at Khooni Darwaza, two kilometres south. With his trial, the formal Mughal empire — which had ruled in some form since 1526 — ended.
It ended in a small room inside Qila-e-Mubarak, the Blessed Fort. The British took the fort and renamed it for its bare stone.
If you go: entry to the Red Fort is ₹35 for Indians, ₹500 for foreigners. Closed Mondays. The Diwan-i-Khas and the trial room are both still accessible inside the main precinct — neither is heavily signposted, which is part of why a guided walk pays off.