561 BC
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The year 561 BC was a year of the pre-Julian Roman calendar. In the Roman Empire, it was known as year 193 Ab urbe condita.<ref>{{#invoke:citation/CS1|citation |CitationClass=web }}</ref> The denomination 561 BC for this year has been used since the early medieval period, when the Anno Domini calendar era became the prevalent method in Europe for naming years.<ref>{{#invoke:citation/CS1|citation |CitationClass=web }}</ref>
EventsEdit
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- All eight solar system planets, including the now redefined dwarf planet Pluto, fall into planetary alignment.<ref>{{#invoke:citation/CS1|citation
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DeathsEdit
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