Anyone remember a history computer game from the mid 90s?

I really want to find this game again but I can't remember what it is called. It involved being on an archaeological dig, you would spend ages digging for artifacts until you found a clay "doughnut". as soon as you found the clay object you were transported back in time to discover what the object was for (weaving loom weight I believe). Once back in time and having discovered the use of this object there seemed to be no conclusive ending to the game. You just went around stealing peoples pigs and never being capable of finding a wheelbarrow to put your heavy nicked objects in.

Just wondering what this game is called? I really want to play it again. I wonder if now with my adult genius I will finally work out the point of the game. Any suggestions? Did anyone else have this game at school and did anyone reach a conclusive end to it?