5 events the sources record for this year, grouped by region.
What happened
China (3)
Zhu Guangqing, a native of Zengcheng County in Guangzhou, rebelled, called himself the Great Jin state, and set the era name Chifu. (History of Yuan (Yuanshi), Annals 元史 卷39 順帝 1337年 1月)
Bang Hu of Chenzhou gathered followers through incense-burning superstition, broke the Luyi county of Guidefu, and burned Chenzhou. (History of Yuan (Yuanshi), Annals 元史 卷39 順帝 1337年)
In the first month, day guimao, Zhu Guangqing of Zengcheng county, Guangzhou, rebelled; Shi Kunshan and Zong Daming joined him, called themselves 'Da Jin Guo', and changed the era name to Chifu; Commander Niusa'er and the Jiangxi Xingsheng Zuo Cheng suppressed them. (Xu Zizhi Tongjian (Continuation of the Comprehensive Mirror) 권207 正月 단락207.0.0)
South Asia (1)
Translator's chronology: Muhammad sends 100,000 cavalry led by Khusraw Malik, his sister's son, to the Karachil (Himalayan) hills and they are crushed; the text says this mountain is ten days from Delhi and three months long (Ibn Battuta, Travels Avertissement p.xx; III p.325-327)
Eastern Europe & Russia (1)
In 1337 Sweden broke the peace, sheltered the rebel Karelians in Vyborg and helped kill merchants of Ladoga and Novgorod. (Karamzin, History of the Russian State 제4권 IX장)