A castle (from Latin: "castellum" ) is a type of fortified structure built in Europe and the Middle East during the Middle Ages by European nobility.
 Scholars debate the scope of the word "castle", but usually consider it to be the private fortified residence of a lord or noble.
 This is distinct from a palace, which is not fortified; from a fortress, which was not always a residence for nobility; and from a fortified settlement, which was a public defence – though there are many similarities among these types of construction.
 Usage of the term has varied over time and has been applied to structures as diverse as hill forts and country houses.
 Over the approximately 900 years that castles were built, they took on a great many forms with many different features, although some, such as curtain walls and arrowslits, were commonplace.
Charles Oudin is one of the oldest French horology firms.
 It was founded in Paris at the end of the 18th century by Jean-Charles (known as Charles) Oudin, who came from a family of clockmakers in Northwest France.
 There were four generations of Oudins who were clockmakers, as of the mid 18th century, first in the Meuse region and later, in Paris.
 Several members of the Oudin family worked for the master watch and clockmaker Abraham-Louis Breguet.
Sarasota Coastal Credit Union (now Achieva Credit Union), was a state chartered credit union and was regulated under the authority of the National Credit Union Administration (NCUA).
 On November 1, 2009, Sarasota Coastal Credit Union merged with Achieva Credit Union, which is headquartered in Clearwater, Florida.
 The merger created a credit union with more than $800 million in assets and more than 90,000 members in seven counties.
 Before the merger, Achieva had members throughout Pinellas, Pasco, Hernando and Hillsborough counties while Sarasota Coastal Credit Union served members throughout Manatee, Sarasota, and Charlotte counties.
Abraham-Louis Breguet (10 January 1747 – 17 September 1823), born in Neuchâtel, Switzerland, was a horologist who made many innovations in the course of a career in watchmaking in France.
 In his lifetime he was considered the leading watchmaker of his day, and he built up a clientele that included many leading public figures and members of the European nobility.
Uradel (] , German: "ancient nobility"; adjective "uradelig" or "uradlig") is a genealogical term introduced in late 18th-century Germany to distinguish those families whose noble rank can be traced to the 14th century or earlier.
 The word stands opposed to "Briefadel", a term used for titles of nobility created in the early modern or modern period by letters patent.
 Since the earliest known such letters were issued in the 14th century, those knightly families in northern European nobility whose noble rank predates these are designated "uradel".
British Liver Trust is a charitable organisation in The United Kingdom which has a focus in the health of the liver.
 Based in the town of Ringwood, the Trust is made up of 14 employed members of staff who are supplemented by voluntary workers.
The Swedish nobility ("Adeln") has historically been a legally and/or socially privileged class in Sweden, and part of the so-called "frälse" (a derivation from Old Swedish meaning "free neck").
 The archaic term for nobility, "frälse", also included the clergy, a classification defined by tax exemptions and representation in the diet.
 Today the nobility does not maintain its former privileges although family names, titles and coats of arms are still protected.
 The Swedish nobility consists of both "introduced" and "unintroduced" nobility, where the latter has not been formally "introduced" at the House of Nobility ("Riddarhuset").
 The House of Nobility still maintains a fee for male members over the age of 18 for upkeep on pertinent buildings in Stockholm.
The 6-15-99 Club was an organization dedicated to assisting the plight of the poor in New York City in the 1890s.
 The group formed branch clubs in stores, factories, and banks, expanding at a rapid rate.
 Employed members were expected to contribute between a penny and two and a half cents to the club daily.
 William De Hertburn (W. d'H.) Washington, of 145 Broadway, and prominent Manhattan businessmen envisioned raising around $13,000 daily.
 Isidor Straus, Oswald Ottendorfer, and former New York City mayor Franklin Edson were proponents of the 6-15-99 Club.
William Thompson Casson (1844–1909) was a leading English coach designer and coach manufacturer, who, in the latter part of the nineteenth century.
 designed and built coaches for Queen Victoria and other members of the European nobility.
 His reputation earned him many honours and accolades; he was elected member of the Royal Society of Arts, and received the rare honour: Freedom of the City of London.
Louis I (1249/50 – 1302) was the Baron of Vaud.
 At the time of his birth he was a younger son of a younger son of the House of Savoy, but through a series of deaths and his own effective military service, he succeeded in creating a semi-independent principality in the "pays de Vaud" by 1286.
 He travelled widely in the highest circles of European nobility (the royal courts of London, Paris and Naples), obtained the right to mint coins from the Holy Roman Emperor, and convoked the first public assembly in the Piedmont to include members of the non-noble classes.
 When he died, his barony was inherited by his son.

Question: Which horologist who served members of European nobility employed members of the Oudin family?
Answer: Abraham-Louis Breguet