8 events the sources record for this year, grouped by region.
What happened
China (2)
A report came from Lingzhou that 20,000 Tibetans had been defeated, and martial law in the capital was lifted. (Old Book of Tang (Jiu Tangshu), Annals 舊唐書 卷11 大歷2年 10月)
In September 767, tens of thousands of Tubo besiege Lingzhou; when light cavalry reaches Panyuan and Yilu, Guo Ziyi leads 30,000 armored men from Hezhong, camps at Jingyang, and the capital is put under martial law. (Zizhi Tongjian (Comprehensive Mirror) 권224 767년 항)
Korean Peninsula (1)
On the third day of the seventh month the gakgan Daegong rebelled; the ninety-six gakgan of the capital and the five provinces fought one another, and great turmoil continued for three months. (Samguk Yusa (Memorabilia of the Three Kingdoms) 紀異第二 惠恭王)
Kunlun and Sapa invaded and took the prefectural city; the strategic commissioner Zhang Baiyi asked for relief. (Đại Việt sử ký toàn thư 外紀卷之五 「丁未。崑崙闍婆來寇，攻陷州城。經」)
Western Europe (3)
As the eastern and western churches are divided over the Trinity and icons, Pippin holds a meeting at Gentilly on this matter and convenes a synod (Royal Frankish Annals ARF(Einhard판) a.767, Kurze 1895 p.25)
After Christmas Pippin advances into Aquitaine, passes Narbonne, attacks and takes Toulouse, and receives the surrender of the regions of Albi and Gévaudan (Royal Frankish Annals ARF(Einhard판) a.767, Kurze 1895 p.25)
In August Pippin comes to Bituriga and holds the general assembly in the open field in the Frankish manner; then he goes to the Garonne and takes the fortresses and caves of Scoraliae, Torinna and Petrocia. He spends the winter and Christmas at Bituriga (Royal Frankish Annals ARF(Einhard판) a.767, Kurze 1895 p.25)