A rich variety of buildings and monuments came to be constructed through the patronage of Turkish, Mughal and other Muslim rulers between the 12th and 18th century. These cannot strictly be described as Muslim architecture as they are as much the work of India's hereditary craftsmen as of the foreign artisans who arrived. It is thus appropriate to regard this phase as a development of Indian architecture under Muslim influence.
The Turko-Afghan rulers and generals had set up the Sultanate by the beginning of the 13th century. These kings who followed one another in quick succession erected splendid victory towers, impregnable forts, luxurious palaces, mosques and mausoleums, both in Delhi and in the provincial capitals.
While in the process of consolidating their power they converted the existing religious structures into improvised mosques. The Quwwat-ul-Islam mosque in Delhi and the Arhai-din-ka-Jhonpra at Ajmer were built mainly out of old Jain and Hindu temples. The next monument in this hierarchy is the Qutab Minar, a giant minaret of over 73 metres. The tomb of Iltutmish is a fine example of Indian work under Islamic patronage. In the same vicinity Alauddin Khilji had a structure built which shows that by this time Indian craftsmen had mastered the alien styles of decoration. The 'true arch' form was also introduced here.
The rugged simplicity of the Turks reasserted itself later in the Tughlaqabad Fort, built by Ghiyasuddin Tughlaq in 1321. There was great building activity under Firuz Tughlaq; but in the Firuz Shah Kotla and the mausoleum at Hauz Khas there is simplicity more due to a none too rich treasury than any other reason. The Lodi tombs are barer. The kingdom was quite unstable from 1414 to 1526 and money was scarce. Sher Shah's tomb is the last in the series of Turkish burial places. It is more elaborate than the Tughlaq or Lodi memorials but still quite plain.
In the provincial kingdoms there was more intimate contact with local traditions. The earliest mosque at Jaunpur is distinguished by a number of carved pillars, which were evidently taken from a temple. The Lal Darwaza mosque and the Atala Masjid owe more to the local styles. In Gujarat Sultan Ahmad adorned Ahmedabad with most splendid buildings which in style and detail are counterparts of the temples of nearby regions. In the city of Mandu a great mosque was built by Hoshang. The techniques of Hindu, Jain and Muslim styles are fused in the structure, superimposed on the whole by a reflection of the power of the Sultans. Similarly, in the architecture of Gaur, the old Muslim capital of Bengal, the cue came from local styles.
In the South the large mosque of Gulbarga, erected in the 14th century, is a unique piece of architecture. This is the only mosque in India which is wholly covered over, sunlight being admitted through the side walls which are pierced with great arches. During the reign of the Adil Shahi Sultans of Bijapur building activity received a major boost.
Notable among the constructions in Bijapur is the Jami Masjid, created out of the remains of Hindu structures, but never completed. Ibrahim Adil Shah took care that his tomb was finished in his lifetime; the entire Quran was engraved on its walls and the skill of South Indian craftsmen was ably used in its construction and ornamentation.
There is very little difference between the styles which matured under the Turko-Afghan kings and the Sultans who ruled in various parts of India and the later styles perfected in Mughal times, except that the Mughal architecture is more elaborate and the synthesis of Hindu and Muslim elements in it is complete. The tomb of Humayun, for instance, is almost a final development of the style which had begun with the Qutab group of buildings and passed through the rough Lodi monuments and Sher Shah’s mausoleum. Persian artisans, brought to India by Humayun, contributed frescoes of their own, bringing in finesse in construction. The material also became finer between 1540 and 1685.
If Humayun's tomb is slightly eclectic, the genius of Akbar, the Great Mughal, combined the foreign and indigenous elements completely. This is evident in Fatehpur Sikri and Akbar's own mausoleum at Sikandara. Akbar's son Jehangir carried on his father's tradition, building two mosques in Lahore apart from his own mausoleum. The most glorious building of his reign is the tomb of Itamud-ud-Daulah at Agra. Built entirely of white marble and covered throughout with mosaic, it marks the beginning of what has been called the Indo-Islamic 'baroque' style.
Shah Jahan, as governor of Gujarat, probably acquired his love of fine buildings from the architecture created by Sultan Ahmad. Those early impressions mingled with his own delicate and sensuous imagination. He brought the same delicacy and love of marble to the Taj Mahal which was built in the memory of his consort, Mumtaz Mahal. The Moti Masjid at Agra is another elegant construction typifying Shah Jahan's concept. The Jami Masjid in Delhi outshines all other buildings of its kind. The Red Fort at Delhi, a replica of the fort at Agra, is further testimony to Shah Jahan's sensibility.
After Shah Jahan the creations of Mughals lost their magnificence and the Indo-Muslim architectural traditions declined.