X was the 6th Surveyor General of India (1830-1843) & was part of the 70 year ‘Great Trigonometric Survey’ to map out of the entire Indian subcontinent. He was known for his pioneering work & detail orientation.
Such was his reputation that when his successor Andrew Scott Waugh found a remarkable (now globally known) landmark in the region, he said it had to be named after X.
Can you identify X or the landmark named after him?