The first common use of an exclusively olive oil-based soap was in Castile, which is - unsurprisingly - how it got its name.
Spanish crusaders returned home with a recipe for Aleppo soap, which used a blend of olive and laurel oils. Since they had no access to laurel, but plentiful supplies of olive oil, they used 100% olive oil in their soaps and it worked rather well.
So much so, that it's been used ever since because olive oil is pretty much the only single oil you can use for soap-making if you're looking for that Goldilocks soap, which is neither too hard nor too soft, and cleansing without being harsh. Tallow is the other option, but that doesn't grow on trees.
Our soaps are made from Spanish olive oil, which we believe to be of the finest quality.
We're currently producing a 50g travel bar as well developing a concentrated liquid soap.