The Timeline shows all the Rulers involved in territorial changes for the selected super cluster during the selected century.

Rulers are considered only when they can be clearly defined. Phersu Atlas includes de facto rulers, which may sometimes be subjective. As a result, the ruler could be a King, President, or others depending on the context.

Cluster is a categorization that includes all iterations of a nation and all the possessions of this nation. Example: the cluster spain includes the iterations of that nation, like the Kingdom of Spain and the First Spanish Republic, whereas possessions of spain include Spanish America and the Spanish Philippines. Super cluster is a categorization that additionally includes the possessions of possessions. Example: A super cluster extends this categorization to include the possessions of a nation's possessions. For instance, during the Iberian Union, Spain not only controlled Portugal through a personal union but also acquired Portugal's colonies, such as Brazil, which are included in the super cluster for Spain.