They stood behind the adults and ate whatever was handed to them. Later, children were allowed to sit at the table, but they couldn't speak unless an adult spoke to them. They couldn't ask for a dish, either. They had to wait until a grownup offered it to them. It was also considered rude to fidget, sing, or look at someone else who was eating.
Table manners are even older than tables.
About 9,000 years ago, people cooked soups in pots. They dipped spoons of wood or bone into the cooking pot to eat. The first rules about eating determined who could dip into the pot first. Today some Inuit families in the Arctic still follow the tradition of eating from a common pot. Men get to dip in first, then women and children.