In Dante Alighieri's Inferno, Canto 4, Cirlce 1, the protagonist enters the Limbo. This is described as the home of virtuous non-christians and children who died without being baptized. Among the virtuous non-christians are Homer, Horace, Ovid, and Lucan (Classical Poets), among other heroes and genius minds of prior times. While the text alludes to the fact that these are not the only people in Limbo, these are the only ones mentioned by name.
Therefore, your best answer is classic poets and unbaptized infants.