Even after crowning himself Emperor Wu, Liu Yu remained frugal. However, he did not care for education and trusted unsavory people. He felt that the nobility had too much power, so he tended to appoint the lower classes to government positions and gave military power to imperial kinsmen. Ironically, because the imperial kinsmen stabilized their military power and wished to gain political power, Emperor Wu was afraid they would have thoughts of usurping the throne. Thus, he also frequently killed his kinsmen.