Cai Shen (财神) aka Deity of Wealth, from the name we shall know, they are Deities that are able to control the wealth or fortune for the mortals.

Since the day when mortal knew how to use money to exchange for other stuffs, Deity of Wealth appeared, not for blessing for mortals to become extremely rich, but to control the flow and movement of the money that involved in the mortals' activities.

So how many Deity of Wealth are there?

Haha, in this World, there are a lot, in folks culture, we have different type of Deity of Wealth, such as Military Wealth (武财), Scholarly Wealth (文财), Directly-Associated Wealth (正财), Physically-Associated Wealth (偏财), etc. Each type of Wealth is being in-charge by one Deity of Wealth.

各路财神的分类、起源有很多种说法，以下经供参考哈^^

民间传说正月初五是财神的生日，所以过了年初一，接下来最重要的活动就是接财神。

财神是中国民间普遍供奉的一种主管财富的神明。一般认为有所谓“正财神”赵公明，“文财神”范蠡，“武财神”关羽，“偏财神”五路神、利市仙官，“准财神”刘海蟾等。

“正财神”：世人奉祀的财神，最为人们熟知的财神，影响最大的则是“正财神”赵公明。

“文财神”：范蠡(lí)，自称陶朱公，是一位文财神。他是春秋战国之际杰出的政治家、思想家和谋略家，同时也是一位生财有道的大商家。

"武财神"：关圣帝君即关羽关云长。传说关云长管过兵马站，长于算数，发明日清薄，而且讲信用、重义气，故为商家所崇祀，一般商家以关公为他们的守护神，关公同时被视为招财进宝的财神爷。

“偏财神”：文武财神是民间所谓的正财神，在正财神之外，还有偏财神，这是就财神所在的神像位置而言的。民间的偏财神经常是指被称为“五路神”的财神。

“准财神”：在中国民间信仰的众多财神中，有一类只能算作是准财神，意为未得财神封号，但由于此神能为人们带来一定的财运，承担了一部分财神的职责，于是人们就将其作为财神看待。刘海蟾就是其中最具代表的一位准财神。