Petronella van Woensel
Petronella van Woensel( 14 May 1785 – 12 November 1839) was a Dutch painter and a graphic artist.
Woensel was born in Raalte and became a pupil of the flower painters Georgius Jacobus Johannes van Os and Jan van Os.
She is known for her flower paintings and from 1822 was an honorary member of the Koninklijke Academie voor Beeldende Kunsten.
There exist also sets of drawings and etchings by her hand, many of them are copy after other masters.
She died in the arms of her best friend and colleague, Maria Margaretha van Os. Woensel died in The Hague.
Joanne van Os
Joanne van Os is an Australian author of memoir, children's and adult fiction.
Dirck van Os
Dirck van Os
(Antwerp 13 March 1556 – Amsterdam 20 May 1615) was an Amsterdam merchant, insurer, financier and shipowner.
He is among the founders of the Compagnie van Verre, the Amsterdam Exchange Bank and the United East India Company (VOC).
Pietro Cussida
Pietro Cussida, Pietro Cuside or Pedro Cossida( died October 1622) was a Spanish diplomat in the service of Philip III of Spain and his successor, Philip IV.
He was an art collector and patron, known for his patronage of Caravaggisti artists, including Jusepe de Ribera and Dirck van Baburen.
Pieter van Os
Pieter Gerardus van Os (8 October 1776 – 28 March 1839) was a Dutch painter and engraver and a member of the renowned Van Os family of artists.
Van Os was born in The Hague the son of Jan van Os.
He studied with his father and from 1794 to 1795 at the Tekenakademie in The Hague.
During this period he copied paintings from the works by Paulus Potter and Charles Dujardin.
Van Os was particularly fond of animals as his subject matter and made such an excellent copy of one of Potter's works - Young Bull - that it was purchased by William V, Prince of Orange.
After completing his training, he departed for Amsterdam, where he supported himself primarily by painting rather mediocre portrait miniatures and giving drawing lessons.
Around 1805 he began to devote himself to producing landscape paintings filled with his favourite subject of cattle and was still strongly influenced by the 17th-century Dutch masters.
In 1808, his "Hilly Landscape with Cattle" (untraced) won the prize provided by King Louis Bonaparte for the best landscape at the first public exhibition of Dutch contemporary art in Amsterdam.
In 1813 and 1814 he trained as a captain of volunteers and experienced military engagements.
This led him to try military subjects in his art.
Emperor Alexander
I of Russia purchased a picture in this theme by Van Os and placed it in his palace at St. Petersburg.
Van Os died in the Hague in 1839.
His son Pieter Frederik van Os (1808 — 1892) became a painter and teacher who taught Anton Mauve among others.
Arie van Os
Arie van Os( born 1937 in Amsterdam) is a Dutch businessman and financial director.
Jan van Os
Jan van Os( 23 February 1744 – 7 February 1808) was a Dutch painter and a member of the renowned Van Os family of artists.
Jóhann Gunnar Sigurðsson
Jóhann Gunnar Sigurðsson (2 February 1882 – 20 May 1906) was an Icelandic poet.
A new New Romantic-style writer, Sigurðsson studied at the Menntaskólinn í Reykjavík until 1903.
Ton van Os
Anthonius Petrus (Ton) van Os (born March 2, 1941) is a Dutch artist, who works as etcher, monumental artist, graphic artist, wall painter, painter, and mosaicist.
Born in Rotterdam,
Van Os studied at the Academie voor Beeldende Kunsten (now Willem de Kooning Academy) from 1958 to 1962.
After graduation, he settled as independent artist in Rotterdam.
From 1994 to 2001 he was lecturer at the ArtEZ Institute of the Arts in Arnhem.
Van Os started his graphic works in the 1960s with people or groups of people as theme.
In the 1970s his work became more abstract and he started to visualize shadings.
In the 1970s he started to receive international attention for his work.
Van Os was awarded the Award on the Threshold prize by the City of Rotterdam in 1962, and the Hendrik Chabot Award in 1974.
Pieter Frederik van Os
Pieter Fredrik van Os( 8 October 1808 – 31 March 1892) was a painter from the Northern Netherlands.
He was the son and pupil of Pieter Gerardus van Os and worked mainly in the spirit of his father.

Question: Who was born first out of Jóhann Gunnar Sigurðsson and Dirck Van Os?
Answer: Dirck Van Os