13 events the sources record for this year, grouped by region.
What happened
China (3)
In the tenth month of the first year of Emperor Hanzei, he makes his capital at Tajihi in Kawachi (Shibakaki palace) (Nihon Shoki (Chronicles of Japan) 日本書紀 卷第十二 反正紀 1年 단락23)
Jiyang Prince Ning killed Han Fan and plotted to attack Guanggu, but Fan learned of it, led troops and attacked Ning; Ning fled to Liangfu, and Fan combined his forces and attacked Liangfu, taking it. (Zizhi Tongjian (Comprehensive Mirror) 卷114 406년 단락19 제4문)
South Asia (9)
Every year on the 8th day of the second month, the procession of images: 20 four-tiered bamboo-frame carts are decorated, and brahmins invite the Buddha into the city. Wealthy families set up free clinics (charity and doctors) to care for the sick and poor (Faxian, A Record of Buddhist Kingdoms Legge 1886 ch.XXVII (법현전 27章))
Going nine yojanas southeast, past a lone rocky mountain (where Śakra questioned an ascetic), then one yojana southwest to the village of Nāla: birthplace and nirvana site of Śāriputra (Faxian, A Record of Buddhist Kingdoms Legge 1886 ch.XXVIII (법현전 28章))
One yojana west reaches the new Rājagṛha: a new city built by King Ajatashatru, two monasteries and Ajatashatru's reliquary stupa. In the southern valley, inside the Five Mountains, the old site of Bimbisara's city is empty (Faxian, A Record of Buddhist Kingdoms Legge 1886 ch.XXVIII (법현전 28章))
On Vulture Peak (Gṛdhrakūṭa): buying incense, flowers and lamps in the new city and hiring two monks, they make offerings at the summit; they chant the Śūraṅgama Sūtra all night and come down to the new city (Faxian, A Record of Buddhist Kingdoms Legge 1886 ch.XXIX (법현전 29章))
The Karanda bamboo grove, the Pippala cave, and the Saptaparṇi cave (Śrataparṇa), where 500 arhats compiled the scriptures after the Buddha's passing; the stone cave of Devadatta and the story of a monk's self-immolation (Faxian, A Record of Buddhist Kingdoms Legge 1886 ch.XXX (법현전 30章))
Twenty li south of Gaya, the place of ascetic practice; passing ruins to the west and north, under the Bodhi tree (pippala) he defeated Mara's temptation and attained Buddhahood. Three monasteries here, with strict precepts (Faxian, A Record of Buddhist Kingdoms Legge 1886 ch.XXXI (법현전 31章))
Three li south, Gurupada (Kukkutapada mountain): a tradition says Mahakashyapa still remains inside the mountain; arhats stay there (Faxian, A Record of Buddhist Kingdoms Legge 1886 ch.XXXIII (법현전 33章))
Turning back toward Pataliputra and following the Ganges for 10 yojanas reaches the Kuangye monastery; 12 yojanas west reaches Varanasi (Bolinai), the city of the kingdom of Kashi (Faxian, A Record of Buddhist Kingdoms Legge 1886 ch.XXXIV (법현전 34章))