More cupcake history

From (the site is fascinating and this is from a small section amidst a huge cake history)

Individually portioned confections have a long and venerable history. Diminutive iterations of popular traditional baked goods are particularly enjoyed when portability and ease of service is appreciated. Cookies, tea cakes, petits fours and cupcakes all spring from the basic same idea.

There seem to be two theories about the origin of recipes titled "cupcake:"

1. The name comes from the amount of ingredients used to make the cake (a cupful of flour, a cupful of butter, cupful of sugar etc.).
---This is very similar to how pound cake was named. In fact, the recipes for cup cakes and pound cakes include pretty much the same ingredients and would have produced similar results.

2. These cakes were originally baked in cups.
---Old cookbooks also sometimes mention baking cakes in small cups. These cups may very well have been earthenware tea cups or other small clay baking pans. These would easily accomodated baking level oven heat and produce individual-sized cakes. This is not the same thing as contemporary metal cupcake pans, enabling cooks to bake a dozen small cakes in one fell culinary swoop.