Frederick is defined as “Philosophical” and “Creative”
“Creative” means you have +2 culture in each city per turn. This will lead to your territory (defined by “Cultural borders”) growing rapidly and can save you building obelisks in your cities. Theatres are built at double speed, giving you even more culture, and Coliseums (also double speed) will make people happier in your growing empire. Discover Construction (a valuable technology in any case) as soon as possible, and acquire Drama when you can. The Globe Theater should be built quickly.
“Philosophical” means having a bonus of Great People appearance (+100% birth rate). However, doubling zero is still zero – so you should either build wonders or create specialists in your cities. Universities (that speed up your research by 25%) are built with double speed, so discovering Education and building Libraries (required for University) is very logical.