The Sunga dynasty was established in 185 BCE, about 50 years after Ashoka's death, when the king Brhadrata, the last of the Mauryan rulers, was brutally murdered by the then commander-in-chief of the Mauryan armed forces, Pusyamitra Sunga, while he was taking the Guard of Honour of his forces.
These stupas, however, are located quite far from the Sunga center of power, and it is questioned whether these works were due to the weakness of the control of the Sungas in these areas, or a late sign of tolerance on their part.