Baked goods have been around for thousands of years. The art of baking was developed early during the Roman Empire. It was a highly famous art as Roman citizens loved baked goods and demanded for them frequently for important occasions such as feasts and weddings etc. Due to the fame and desire that the art of baking received, around 300 BC, baking was introduced as an occupation and respectable profession for Romans. The bakers began to prepare bread at home in an oven, using mills to grind grain into the flour for their breads. The oncoming demand for baked goods vigorously continued and the first bakers' guild was established in 168 BC in Rome. This drastic appeal for baked goods promoted baking all throughout Europe and expanded into the eastern parts of Asia. Bakers started baking breads and goods at home and selling them out on the streets. Some bakeries provide services for special occasions (such as weddings, birthday parties, anniversaries, or even business events) or for people who have allergies or sensitivities to certain foods (such as nuts, peanuts, dairy or gluten). Bakeries can provide a wide range of cakes designs such as sheet cakes, layer cakes, tiered cakes, and wedding cakes. Other bakeries may specialize in traditional or hand made types of bread made with locally milled flour, without flour bleaching agents or flour treatment agents, baking what is sometimes referred to as artisan bread.