Question: Who was born first, Celedonio Calatayud or Wilhelm Conrad Röntgen?

Context articles: Conrad Ramstedt
Fällt
Röntgen Memorial Site
Alexander Raven Thomson
Friedrich Wilhelm Conrad Eduard Bornhardt
Augustine of Canterbury
Wilhelm Röntgen
Celedonio Calatayud
X-ray tube
Roentgen (unit)

Wilhelm Conrad Ramstedt (1 February 1867 – 7 February 1963) was a German surgeon remembered for describing Ramstedt's operation.
Fällt was an independent publishing house specialising in experimental music, fine art, design and criticism.
 Established in the mid-1990s by Christopher Murphy and W. Conrad Röntgen as a publishing vehicle for experimental multidisciplinary works, Fällt ceased publishing in 2010, but continues to exist as an online archive of works, available in a variety of digital formats.
The Röntgen Memorial Site in Würzburg, Germany is dedicated to the work of the German physicist Wilhelm Conrad Röntgen (1845–1923) and his discovery of X-rays, for which he was granted the Nobel Prize in physics.
 It contains an exhibition of historical instruments, machines and documents.
Born in Edinburgh, Scotland, he came from a leading family and was the grandson of the architect Alexander Thomson.
 Thomson was educated in universities in his homeland, the United States and briefly Heidelberg University in Germany, studying sciences and philosophy.
 In 1926 he became a partner in an engineering firm in London.
 Whilst studying in Germany, Thomson met and married Lisbeth, the daughter of x-ray pioneer Wilhelm Conrad Röntgen.
 They would go on to have three children together; Lisbeth already had a daughter from a previous relationship, while Thomson also had a long-term mistress, Olive Burdett.
 Upon his return to Britain he made his money from the manufacture of silver paper, a process he had learned in Germany.
Friedrich Wilhelm Conrad Eduard Bornhardt (20 April 1864 Braunschweig - 2 December 1946 Goslar) was a German geologist, engineer and explorer, and was Director of the Berlin College of Mines (Bergakademie) from 1907 to 1916.
Augustine of Canterbury (born first third of the 6th century – died probably 26 May 604) was a Catholic Benedictine monk who became the first Archbishop of Canterbury in the year 597.
 He is considered the "Apostle to the English" and a founder of the Catholic Church in England.
Wilhelm Conrad Röntgen ( ; ] ; 27 March 1845 – 10 February 1923) was a German mechanical engineer and physicist, who, on 8 November 1895, produced and detected electromagnetic radiation in a wavelength range known as X-rays or Röntgen rays, an achievement that earned him the first Nobel Prize in Physics in 1901.
 In honour of his accomplishments, in 2004 the International Union of Pure and Applied Chemistry (IUPAC) named element 111, roentgenium, a radioactive element with multiple unstable isotopes, after him.
Celedonio Calatayud Costa (] ) October 29, 1880 in Pedreguer – January 24, 1931 in Madrid) was a Spanish scientist and radiologist, remembered for his achievements on radiology, radiotherapy, and electrology.
 He pioneered the use of radiology and electrology in Europe for both diagnostics and therapeutical purposes, introducing radiotherapy in Spain in 1906.
 He founded the Spanish Medical Electrology and Radiology Society (Sociedad Española de Radiología y Electrología Médicas), promoted the doctoral chair of Electro-radiology and was elected as the first professor to chair it at the Universidad Central (later renamed Complutense University of Madrid).
 He also was the driving force behind and creator of the First National Medical Congress that took place in Madrid in 1919, precursor of the use of diathermy in gynecologic therapy, founder of the "Spanish Journal of Medical Electrology and Radiology" ("Revista Española de Radiología y Electrología Médicas") and "Tribuna Médica", as well as author of many papers on electrodiagnosis, electrotherapy, roentgenology, and radiotherapy.
An X-ray tube is a vacuum tube that converts electrical input power into X-rays. X-ray tubes evolved from experimental Crookes tubes with which X-rays were first discovered on November 8, 1895, by the German physicist Wilhelm Conrad Röntgen.
 The availability of this controllable source of X-rays created the field of radiography, the imaging of partly opaque objects with penetrating radiation.
 In contrast to other sources of ionizing radiation, X-rays are only produced as long as the X-ray tube is energized.
 X-ray tubes are also used in CT scanners, airport luggage scanners, X-ray crystallography, material and structure analysis, and for industrial inspection.
The roentgen or röntgen ( ) (symbol R) is a legacy unit of measurement for the exposure of X-rays and gamma rays up to several megaelectronvolts.
 It is a measure of the ionization produced in air by X-rays or gamma radiation and was the first international measurement quantity of ionising radiation to be defined for radiation protection as it was a convenient method of measuring air ionization directly.
 It is named after the German physicist Wilhelm Röntgen, who discovered X-rays.