Some context: Matthew Paris, known as Matthew of Paris (Latin: Matthaeus Parisiensis, lit. "Matthew the Parisian"; c. 1200 - 1259), was a Benedictine monk, English chronicler, artist in illuminated manuscripts and cartographer, based at St Albans Abbey in Hertfordshire. He wrote a number of works, mostly historical, which he scribed and illuminated himself, typically in drawings partly coloured with watercolour washes, sometimes called "tinted drawings". Some were written in Latin, some in Anglo-Norman or French verse.
In some of Paris' manuscripts, a framed miniature occupies the upper half of the page, and in others they are "marginal" - unframed and occupying the bottom quarter (approximately) of the page. Tinted drawings were an established style well before Paris, and became especially popular in the first half of the 13th century. They were certainly much cheaper and quicker than fully painted illuminations. The tradition of tinted drawings or outline drawings with ink supplemented by coloured wash was distinctively English, dating back to the Anglo-Saxon art of the mid-10th century, and connected with the English Benedictine Reform of the period. A strong influence on one branch of the style was the Carolingian Utrecht Psalter, which was at Canterbury from about 1000 to 1640. This was copied in the 1020s in the Harley Psalter, and in the Eadwine Psalter of the mid-12th century.  Recent scholarship, notably that of Nigel Morgan, suggests that Paris' influence on other artists of the period has been exaggerated. This is likely because so much more is known about him than other English illuminators of the period, who are mostly anonymous. Most manuscripts seem to have been produced by lay artists in this period. William de Brailes is shown with a clerical tonsure, but he was married, which suggests he had minor orders only. The manuscripts produced by Paris show few signs of collaboration, but art historians detect a School of St Albans' surviving after Paris' death, influenced by him.  Paris' style suggests that it was formed by works from around 1200. He was somewhat old-fashioned in retaining a roundness in his figures, rather than adopting the thin angularity of most of his artist contemporaries, especially those in London. His compositions are very inventive; his position as a well-connected monk may have given him more confidence in creating new compositions, whereas a lay artist would prefer to stick to traditional formulae. It may also reflect the lack of full training in the art of the period. His colouring emphasises green and blue, and together with his characteristic layout of a picture in the top half of a page, is relatively distinctive. What are probably his final sketches are found in Vitae duorum Offarum in BL MS Cotton Nero D I.
What did he paint?
A: He was somewhat old-fashioned in retaining a roundness in his figures,

Some context: Osceola was named Billy Powell at birth in 1804 in the Creek village of Talisi. now known as Tallassee, Alabama, in current Elmore County. "The people in the town of Tallassee...were mixed-blood Native American/English/Irish/Scottish, and some were black. Billy was all of these."
Through the 1820s and the turn of the decade, American settlers kept up pressure on the US government to remove the Seminole from Florida to make way for their desired agricultural development. In 1832, a few Seminole chiefs signed the Treaty of Payne's Landing, by which they agreed to give up their Florida lands in exchange for lands west of the Mississippi River in Indian Territory. According to legend, Osceola stabbed the treaty with his knife, although there are no contemporary reports of this.  Five of the most important Seminole chiefs, including Micanopy of the Alachua Seminole, did not agree to removal. In retaliation, the US Indian agent, Wiley Thompson, declared that those chiefs were deposed from their positions. As US relations with the Seminole deteriorated, Thompson forbade the sale of guns and ammunition to them. Osceola, a young warrior rising to prominence, resented this ban. He felt it equated the Seminole with slaves, who were forbidden to carry arms.  Thompson considered Osceola to be a friend and gave him a rifle. Osceola had a habit of barging into Thompson's office and shouting complaints at him. On one occasion Osceola quarreled with Thompson who had the warrior locked up at Fort King for a two nights until he agreed to be more respectful. In order to secure his release, Osceola agreed to sign the Treaty of Payne's Landing and to bring his followers into the fort. After his humiliating imprisonment, Osceola secretly prepared vengeance against Thompson.  On December 28, 1835, Osceola, with the same rifle Thompson gave him, killed Wiley Thompson. Osceola and his followers shot six others outside Fort King, while another group of Seminole ambushed and killed a column of US Army, over 100 troops, marching from Fort Brooke to Fort King, in what Americans called the Dade Massacre. These nearly simultaneous attacks began the Second Seminole War.
What attacks caused it?
A:
On December 28, 1835, Osceola, with the same rifle Thompson gave him, killed Wiley Thompson.