|Photo from 1 Wedding Source|
I had not heard this reference of a wedding cake. I happened to be watching Food(orgraphy), The History Of Pastry. In that show, there was a mention of the Brides Pie. Hummm, I did a little bit of digging and here is what I found.
The Brides Pie is dish popular in the 17th and 19th centuries, so maybe your great great grandmother had a slice at a wedding celebration. The pie is a concoction of sweet breads, bacon, chestnuts, nutmeg, butter, oysters, and sliced dates or a mutton pie could have been presented. A glass ring was also on the ingredient list. The lady who found the ring would be the next to marry. In more elaborate weddings the brides pie was the centerpiece and the cake seemed to put the attention on the bride. Other prefix names used bride bed, bridegroom, bridesmaid.