In 2003, a tall skeleton belonging to a young adult individual was recovered from a post‐medieval cemetery situated north‐east of the modern city of Erzurum, Turkey. The sex of the individual was not possible to determine. The predicted stature values range from 182 to 200 cm with the average 188.94 cm. The growth was proportional on almost all bones, except for the cranial and facial bones. The selected metric data were compared with the mean values of the male individuals from the same cemetery for differential diagnosis. The individual exhibits characteristics of both pituitary gigantism and acromegaly due to the tumour formation developed in the intrasellar area. Pathological features such as severe osteoarthritis, enthesis and new bone formation around and on the joint surface of the post‐cranial bones, kyphoscoliosis and ankylosis are in agreement with these diagnoses as well. Copyright © 2017 John Wiley & Sons, Ltd.