* Special Relativity: This theory was first proposed by Albert Einstein in 1905 in his paper titled "On the Electrodynamics of Moving Bodies."
* General Relativity: This theory was published by Einstein in 1915, building upon the foundation of special relativity.
Therefore, while the initial concept of special relativity was put forward in 1905, the complete theory of relativity, encompassing both special and general relativity, took shape in 1915.
