Kalapahad or Kala Pahar (Black Mountain) was the title of an Iconoclast Muslim general of Mughal governor Sultan Sulaiman Karrani of Bengal.
There are some, like Dr. Harekrushna Mahatab, Dr.Nilakantha Dash and Dr. Krushna Chandra Panigrahi who hold that the Panji dates from the reign of Ramachandra Deva I who re-established the worship of Lord Jagannath after Kalapahad said to have destroyed it.The arguments are complex, but it is likely that much of the early record was indeed lost in the period that followed Kala Pahar and was rewritten in a fashion that mixed legend with history.