Sun Tzu proved on the battlefield that his theories were effective (for example, at the Battle of Boju), that he had a successful military career, and that he wrote "The Art of War" based on his tested expertise. However, the "Zuozhuan", a historical text written centuries earlier than the "Shiji", provides a much more detailed account of the Battle of Boju, but does not mention Sun Tzu at all. Beginning around the 12th century, some scholars began to doubt the historical existence of Sun Tzu, primarily on the grounds that he is not mentioned in the historical classic "Zuo zhuan", which mentions
St Mark Passion (attributed to Keiser) St Mark Passion (attributed to Keiser) Jesus Christus ist um unsrer Missetat willen verwundet is a St Mark Passion which originated in the early 18th century and is most often attributed to Reinhard Keiser. It may also have been composed by his father Gottfried or by Friedrich Nicolaus Bruhns. Johann Sebastian Bach produced three performance versions of the Passion, the last of which is a pasticcio with arias from George Frideric Handel's "Brockes Passion". There are two other extant 18th-century versions of the Passion, both of them independent of Bach's versions. The Passion was performed in at least three cities