How many dynasties are there in Japanese history? Did Nobunaga and Toyotomi Hideyoshi claim the title?

Different countries cannot be treated by the same standards: for example, in China, it is best to divide the times by dynasties, because the duration of dynasties can be regarded as a historical period. The Roman empire can only use the times, such as the "Five Emperors' Age". First, because the Roman Empire can only be studied separately, the interval between its periods is very small. Second, the Roman Empire, as a civilization that experienced rise, prosperity, decline and finally disappeared, can more easily reflect the process of dividing one era into another. China is a civilization with a long history, which has experienced several ups and downs, but it has never died out. It is impossible to explain historical laws with too small an interval. In Japan, the criteria for dividing history are different. Although it is also an era, it is not only far from the ancient Roman era, but also more like the dynasty of China. However, due to the long-term overhead of the Japanese emperor in history, most of the actual rule was to conquer foreign generals, and the actual institutions were also the so-called shogunate generals. Therefore, it is not accurate to name it after the dynasty. Toyotomi Hideyoshi's position was Guan Bai, and he became the actual consul at the end of the Warring States Period. But not the so-called "emperor". Nominally, the general and Guan Bai were both subordinates of the Emperor, which is why they later said that they would "return to the throne" when they overthrew the Tokugawa shogunate. This is also the reason why Japan can't be marked by dynasties: Japan has only one dynasty in name, that is, the "Emperor Dynasty", which is divided into many eras, such as the Warring States period, the Edo period (that is, the Tokugawa shogunate period) and so on. In fact, Japan has always been the "Emperor Dynasty". The emperor has always been the head of state (in name only). Japanese history has long been in the era of China's achievements in the Spring and Autumn Period, and the enfeoffment system is relatively perfect. Therefore, Japan's civil war can be regarded as the battle of princes, and walking can be regarded as the leader of princes such as the Spring and Autumn Five Powers.