Lethe

Born around 1785 in Upper Marlboro, Md., Alethia “Lethe” Browning Tanner grew up enslaved with her two sisters on a plantation near the Patuxent River in Maryland.

“We could’ve fallen into the River Lethe,” she said.

And a few years before that, he’d fought a Titan on the banks of the Lethe, near Hades’s palace.

“Yeah, the Lethe,” he muttered.

Thalia Grace, Nico di Angelo, and Percy had worked together to defeat Bob on the banks of the Lethe.