The kingdom prospered under his wise rule.

Meaning: The country was doing very well because the king made good decisions.

Choice of Words: Kingdom is a country ruled by a king or queen. Prospered means thrived or succeeded. Under indicates a position or state of being below or beneath. Wise means having or showing knowledge and good judgment. Rule is the exercise of power or authority. Together, they convey the idea of a successful and well-governed kingdom.