Mount Pinatubo is in the Luzon island of the Philippines. The ancestral Mount Pinatubo started 1.1 million years ago that erupted 35 thousand years earlier where the modern Mount Pinatubo arise. The modem Pinatubo erupted on June 15, 1991.
No. Compared with other volcanoes of the same type, Mount Pinatubo is relatively small. Its 1991 eruption was very large, but by no means the largest. The 1815 eruption of Mont Tambora was more than 10 times larger.