Analysis of information sources in references of the Wikipedia article "Philosophical skepticism" in English language version.
Undecidability and the ten modes As part of his Pyrrhonian revival Aenesidemus assembled various kinds of skeptical arguments, or modes, designed to induce epoche.
Pyrrhonism, in whatever form it might have taken after Timon's death in 230 BCE, was utterly neglected until Aenesidemus brought it back to public attention
Aenesidemus criticized his fellow Academics for being dogmatic...Aenesidemus committed his scepticism to writing probably some time in the early-to-mid first century BCE...leading Aenesidemus to dismiss them as "Stoics fighting against Stoics."
Those who believe they have discovered it are the "dogmatists", specially so called - Aristotle, for example, and Epicurus and the Stoics and certain others; Cleitomachus and Carneades and other Academics treat it as inapprehensible:the skeptics keep on searching. Hence it seems reasonable to hold the main types of philosophy are three - the dogmatic, the Academic, and the skeptic.