In the late 1700s, many houses consisted of a large room with only one
chair. Commonly, a long wide board folded down from the wall, and was
used for dining. The "head of the household" always sat in the chair
while everyone else ate sitting on the floor. Occasionally a guest, who
was usually a man, would be invited to sit in this chair during a meal.
To sit in the chair meant you were important and in charge. They called
the one sitting in the chair the "chair man." Today in business, we use
the expression or title "Chairman" or "Chairman of the Board."
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It are a fact
I know because of my learnings.