Step 1: Mahabalipuram (Mamallapuram) is famous for its rock-cut architecture and shore temples. Step 2: These were built during the reign of the Pallava dynasty, especially under Narasimhavarman I and Rajasimha. Step 3: The "Seven Pagodas" refers to a group of temples on the shore, of which only the Shore Temple survives prominently.
\[
\boxed{\text{Pallavas}}
\]