Here, he says, "once below a time." It sounds like something is buried under time, sort of like what happens when something dies, right? But also, something like treasure that needs to be recovered. And what was happening below this time? The speaker spent his days ruling over the trees and leaves and daisies and barley and rivers, blown by the wind.The gist here is that he felt like a young, powerful, world-at-his-fingertips prince. Things were easy, beautiful, and awesome.