Taizu had decreed that succession should go to the eldest son of the empress or to the son’s eldest son if the son predeceased his father, the system generally followed by earlier dynasties. In Ming times, the flaws in this system became apparent as one mediocre, obtuse, or erratic emperor followed another.

Because Taizu had abolished the position of chancellor, emperors turned to secretaries and eunuchs to manage the paperwork. Eunuchs were essentially slaves. Society considered eunuchs the basest of servants, and Confucian scholars heaped scorn on them. Yet Ming emperors, like rulers in earlier dynasties, often preferred the always-compliant eunuchs to high-minded, moralizing civil service officials.

In Ming times, the eunuch establishment became huge. By the late fifteenth century the eunuch bureaucracy had grown as large as the civil service. After 1500 the eunuch bureaucracy grew even more rapidly, and by the mid-sixteenth century seventy thousand eunuchs were in service throughout the country, with ten thousand in the capital. Tension between the two bureaucracies was high. In 1420 Chengzu set up a eunuch-run secret service to investigate cases of suspected corruption and sedition in the regular bureaucracy. Eunuch control over vital government processes became a severe problem.

In hope of persuading emperors to make reforms, many Ming officials risked their careers and lives by speaking out and engaging in public protests. The Confucian tradition celebrated these acts of political protest as heroic. Rarely, however, did they succeed in moving an emperor to change his mind.

Although the educated public complained about the performance of emperors, no one proposed or even imagined alternatives to imperial rule. High officials were forced to find ways to work around uncooperative emperors, but they were not able to put in place institutions that would limit the damage an emperor could do. Knowing that strong emperors often acted erratically, many high officials came to prefer weak emperors who let them take care of the government.