Kantianism
Kantianism is the philosophy of Immanuel Kant, a German philosopher born in Königsberg, Prussia (now Kaliningrad, Russia). The term "Kantianism" or "Kantian" is sometimes also used to describe contemporary positions in philosophy of mind, epistemology, and ethics.
Joseph Green (merchant)
Around 1764 Green met Kant and became a close member of his circle of friends. Kant went often to Green's house outside of Königsberg in Juditten. Green shared with Kant a deep appreciation of the ideas of David Hume and Jean-Jaques Rousseau, in addition, Green could provide as perspective of the outside world that was helpful for Kant. Meeting on a regular basis, Kant discussed his work with him, so every sentence of his "Critique of Pure Reason" prior to the 1781 publication. Kant also entrusted Green with his money.