Which Inca rulers led the greatest period of imperial expansion?

The greatest period of imperial expansion for the Inca empire occurred under the leadership of two successive emperors, Pachacuti Inca Yupanqui and his son, Topa Inca Yupanqui.12

While the Inca began as a small tribe in the Cuzco valley, their rapid transformation into a vast empire was primarily accomplished during the 30-year period between 1463 and 1493.2

• Pachacuti Inca Yupanqui (r. 1438–1471): Often likened to Philip II of Macedonia, Pachacuti initiated the swift, far-ranging expansion of the state. He conquered territories south to the Lake Titicaca Basin and north to Quito, Ecuador, subduing powerful groups such as the Chanca and the Chimú.123
• Topa Inca Yupanqui (r. 1471–1493): Regarded as a counterpart to Alexander the Great, he continued his father's work by bringing most of the Central Andes under Inca rule. He expanded the empire to its southernmost limit at the Maule River in central Chile and incorporated the southern coast of Peru.1432