generate questions: The major architectural undertakings were the buildings of abbeys and cathedrals. From about 900 CE onwards, the movements of both clerics and tradesmen carried architectural knowledge across Europe, resulting in the pan-European styles Romanesque and Gothic.
What type of buildings were took the most effort to build? {sep_token} What were the most important buildings of the time? {sep_token} What two groups spread knowledge of architecture in Europe? {sep_token} What style is Gothic? {sep_token} What is another pan-European style? {sep_token} When did the clerics and tradesmen start spreading architectural information?