Nope, the Heavy (8 oxen) Plow was invented right during the period you're describing; 8th to 11th century. It forced individual peasant families to band together to get enough oxen to pull it over more ground than they could all cover with single plows combined.

This led directly to peasants working in reciprocal relationships with non-blood related neighbours, undermining the clan system and creating the basis for the high-trust societies that we (and only we; not even the Romans acheived this) inherited.