Alberto Caeiro is a fictional character created by the Portuguese poet Fernando Pessoa. He is one of Pessoa's heteronyms, which are distinct literary personas with their own unique styles and philosophies. Caeiro is known for his simple, pastoral poetry that emphasizes nature and the importance of sensory experience. Caeiro's work reflects a philosophy of realism and a rejection of metaphysical speculation. He celebrates the beauty of the natural world and advocates for a direct, unmediated relationship with it. His poems often convey a sense of tranquility and acceptance, making him a central figure in Pessoa's literary exploration of identity and existence.