Wikipedia's Origin section documents rogan josh being brought to North India by the Mughals in the 16th century and becoming a staple of the Kashmiri wazwan, but narrates this as a continuing evolution (through a later British Indian restaurant form) with no year or reign given for when the dish's Kashmiri identity was established. No defensible closing year for the origin period was found in the source.
What would resolve this A dated primary or secondary source (a Mughal-era or early colonial Kashmiri court or culinary record, or a peer-reviewed food-history study) naming when rogan josh became a recognized, named Kashmiri dish rather than an ongoing Persian import.
OpenCulinary history / South Asian historyRogan Josh (Wikipedia)