Short answers, pulled from the story.
Karl Christian Friedrich Krause introduced the term panentheism in the year 1828. He developed this concept to distinguish his views from those of Georg Wilhelm Friedrich Hegel and Friedrich Wilhelm Joseph Schelling.
Charles Hartshorne began examining conceptions of God in the 1940s to develop process theology. He lived from 1897 until 2000 while formulating a doctrine where God could become more perfect.
The Purusha Sukta section of the Rig Veda was compiled before 1100 BCE. This text describes the spiritual unity of the cosmos through the nature of Purusha or cosmic being.
Moses ben Jacob Cordovero lived from 1522 to 1570 within the kabbalistic system that Moshe Idel identified as containing divine immanence. Isaac Luria later proposed the doctrine of tzimtzum which some scholars debate as panentheistic.
Lakota theology describes this divine presence as both transcending and immanent in everything. The Great Spirit concept appears across many tribes as a deep mystery which creates and sustains all creation.