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Who isolated magnesium, calcium, strontium, and barium as impure metals in 1808?

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A color-coded periodic table of the elements displays each element's symbol and atomic number, with categories such as alkali metals, noble gases, halogens, transition metals, and actinoid elements distinguished by different background colors. — alkaline-earth metal Modern version of the periodic table of the elements (printable).

The English chemist Sir Humphry Davy isolated magnesium, calcium, strontium, and barium as impure metals in 1808. He achieved this by utilizing the electrolytic method, a technique he had previously employed to isolate the alkali metals potassium and sodium.12