Qutub Minar historical timeline

The Qutb complex grew by addition rather than from one finished design. Each ruler worked beside earlier fabric, leaving a sequence of towers, mosque expansions, tombs and gateways that makes the political establishment of the Delhi Sultanate physically readable.

Chronology

1. 4th century A.D. The Sanskrit-inscribed Iron Pillar is made for a ruler named Chandra. Its later relocation places a much older object inside the mosque courtyard.
2. 1198 Qutb ud-Din Aibak establishes the Quwwat-ul-Islam mosque. Reused carved columns remain visible around its courtyard.
3. 1199 Work begins on Qutb Minar at the mosque’s south-east corner. The first storey establishes the tower’s alternating fluting and inscription bands.
4. 1235 Iltutmish’s tomb is built within the complex. Its square chamber survives with dense geometric, arabesque and inscriptional carving.
5. Early 13th century Iltutmish enlarges the mosque and raises additional minar storeys. Changes in profile and carving remain visible as the eye moves upward.
6. 1311 Alauddin Khalji completes Alai Darwaza and expands the ensemble. The gateway’s geometry and construction mark a later stage of Indo-Islamic building.
7. 1296–1311 Alauddin starts a second tower intended to exceed Qutb Minar. Only the massive 25-metre first storey of Alai Minar remains.
8. 14th–16th centuries Firuz Shah Tughlaq and Sikandar Lodi repair the minar after damage. The upper storeys preserve those later interventions.
9. 1829 Major Robert Smith repairs the tower and adds a cupola. The cupola is later removed and now stands separately in the grounds.
10. 1993 UNESCO inscribes the ensemble under criterion (iv). Protection covers the tower and the surrounding religious, funerary and educational structures.

Survival and restoration

The complex survives as a group of buildings from different periods, not a single restored state. Repairs to the minar respected earlier profiles while leaving changes in stone and detail visible. The mosque is fragmentary, Alai Minar was never completed, and reused carved elements still expose how the first builders assembled the new precinct.

UNESCO describes the state of conservation as stable and the main forms, locations and materials as substantially authentic. Periodic work is intended to be reversible. The separate cupola, unfinished tower and repaired upper storeys make restoration history part of what can be seen.

• Official website
• Wikipedia