View source for 1090

=== By topic ===

==== Arts and Culture ====
* [[Troubadour]]s begin playing in western [[Duchy of Aquitaine|Aquitaine]] ([[Poitou]] and [[County of Saintonge|Saintonge]]) and [[Duchy of Gascony|Gascony]] (approximate date).

==== Science and Technology ====
* [[Qin Guan]], [[Chinese poetry|Chinese poet]] of the [[Song dynasty]], writes the ''Can Shu'' (Book of [[Sericulture]]), which describes a [[silk]]-reeling machine that has the world's oldest known [[Belt (mechanical)|mechanical belt drive]].</onlyinclude>