Incas developed a system of accounting, where from a series of chords and with knots of different color a various thickness they kept exact records of different transactions.
Origin of Inca
Still nobodies know where the Incas had come from, or how long they had been around. There were many legends on which to base rough guesses.
Huallpa Huascar was Inca Emperor from 1527 to 1532 AD. But his regime was not a regular regime. During his whole regime he had a civil war with his brother Atahualpa. His regime ended with his death at this war.
Emperor Huayna Capac, father of Huascar died of smallpox without clearly fixing his successor. Actually Huascar should be the real successor. But Huayna Capac liked his other son Atahualpa to be Emperor. So he decided that Huascar would be the Emperor, and his brother Atahualpa would be the governor of the Quito. During a small pox attack Huayna Capac died prematurely without naming a successor. Since before his death he could not mentioned his successor, it remained unclear who should be the next Empire. At this point both Huascar and Atahualpa wished to be Emperor. So finally a war started between Huascar and Atahualpa. Huascar was not kind of warrior, and Atahualpa was more powerful with the help of his mighty army. So Huascar regime was never peaceful. Finally he died on the war on 1532 AD. Huascar was believed to irresponsible and half mad. He ordered the slaughter of all the males and pregnant women in two cities close to Cusco.