Two different isotope systems were analyzed in his tooth enamel, each providing a different type of information.

The oxygen isotope ratios in his teeth reflect the water he drank during the period when those specific teeth were forming, which is to say, during childhood.

Oxygen isotope ratios in water vary with climate: colder climates tend to produce water with lower oxygen-18 ratios, warmer climates produce water with higher ratios.

The oxygen isotopes in Conquest Man’s tooth indicate that he spent at least part of his childhood in a colder climate than Barton-upon-Humber.

This could mean he grew up somewhere in Scandinavia, or in the colder parts of Britain, or in a higher-altitude environment with colder temperatures.