Abd-ul-Haq, given the title Amanat Khan by Shah Jahan, was the calligrapher who designed and wrote the Quranic inscriptions on the Taj Mahal. He is the only person permitted to sign that building, and his signature is on it.
He was a Persian who came to India with his brother, worked at Agra and Delhi, and after his brother's death withdrew from court.
He built a serai in what is now Tarn Taran district in Punjab, on the Lahore to Delhi road, and put his own calligraphy and glazed tilework on its gateways. He is buried there.
The serai is a large walled enclosure with two monumental gateways, deteriorating, in a village named after him.
The man who wrote the Taj Mahal is buried in a Punjab village and there is no signage on the road.
The inscriptions at the Taj Mahal are in thuluth, inlaid in black marble, and the letters increase in size with height so that they read as one size from the ground. That correction is the technical achievement he is known for.
He signed the inscription at the gateway. It is the only signature by any craftsman anywhere on the building, and nobody else who worked on it is named.
The serai at Sarai Amanat Khan is on the road between Amritsar and the border. Its gateways carry glazed tilework of the same period and the building is deteriorating without any conservation programme of consequence.