Representatives and direct Taxes shall be apportioned among the several States which may be included within this Union, according to their respective Numbers, which shall be determined by adding to the whole Number of free Persons, including those bound to Service for a Term of Years, and excluding Indians not taxed, three fifths of all other Persons. (Previous sentence amended by the 14th Amendment, Section 2)
Although a person didn’t have to be royalty (or rich) to be part of Congress, there were still barriers. Native Americans (Indians), for example weren’t taxed so they didn’t get to be counted as part of the census—they’re not going to be part of Congress. Originally, representatives and “direct taxes” (whatever that means—apparently it could cover just about any form of taxes) to the government among the States of the Union (that being the States which are United under this Constitution thus forming a New Government), were figured out by the addition (or a counting) of all free individuals—including those who are contractually not-Free for a set amount of years.
And it’s here where we come face to face with the original 3/5th Person rule Compromise.