Leonardo da Vinci's notebooks are a working record of a restless mind, filled with anatomical drawings, engineering sketches, optical studies and, among the geometric material, pages of overlapping-circle grids of the kind now widely called the Flower of Life and Seed of Life patterns. He studied these grids in the Codex Atlanticus across the decades from roughly 1478 to 1519, working through their proportions as a matter of geometric interest, the same interest running through the rest of his technical notebooks.
That documented fact and the modern sacred-geometry reading of the same pattern are two different things, and the separate articles on Flower of Life and Seed of Life keep them separate. The circle-grid pattern itself is genuinely ancient and geographically wide, attested on Assyrian palace thresholds, Roman mosaic floors and in Islamic geometric design centuries before Leonardo drew it; his notebooks are one more data point in that documented history, not its origin. The name Flower of Life, the sequence running from a single circle through the seven-circle Seed to the nineteen-circle Flower, and the spiritual meanings attached to each stage are a late twentieth century development, set out and popularized by Drunvalo Melchizedek from the mid-1980s onward, with no demonstrated line of transmission back to Leonardo or any earlier appearance of the pattern.
What Leonardo's notebooks actually show is a Renaissance polymath doing what he did with nearly every subject that caught his attention: taking a known geometric construction and working out its proportions more rigorously than his predecessors had, for its own sake, centuries before anyone attached a name like Flower of Life to the result.
Sources Sacred Geometry: Philosophy and PracticeRobert Lawlor with The Ancient Secret of the Flower of Life, Volume 1Drunvalo Melchizedek