How big is an iugăr? It depends who is measuring

The jug is the wooden beam that sits on the necks of oxen harnessed to a cart or a plough. The Romanian word comes from Latin iugum by the straight road, with no detours — a genuine inheritance from spoken Latin.

So the most Latin-looking word — iugăr — is actually the latest arrival: Ciorănescu's etymological dictionary dates it only to the eighteenth century. The yoke was kept from olden times; the iugăr was taken back out of books, late.

The reckoning starts here, but not the one you expect: the ploughing day explains the old measures without making them equal to each other.

Varro does something cleverer than a definition: he does comparative geography. In Further Spain, he writes, fields are measured in iuga; in Campania, in versus; in Rome and Latium, in iugera. Only then does he define each measure in turn — and the ploughing day is his definition of the Spanish iugum, not of the Roman iugerum.

Pliny the Elder makes the working-day connection — and then spoils it with figures. On easy soil, a pair of oxen ploughs one iugerum a day at first ploughing, and one and a half at second ploughing. On difficult soil, the same pair manages only half a iugerum in a day at first ploughing. The ploughing day explains the unit. It does not recalculate it every morning.

Columella gives the geometric reckoning: the square actus is 120 by 120 feet; doubled, it makes a iugerum of 240 by 120 feet — 28,800 square feet, about 2,520 square metres. As for the name, he offers a different explanation from the yoke: iugerum would come from the two actus "joined", iunctum. The Romans themselves gave more than one explanation; we need not settle for just one.

The cadastral iugăr is not the Roman iugerum grown large. It is the Romanian name of the cadastral hold — Katastraljoch, kataszteri hold — of the Habsburg cadastre: 1,600 Vienna square fathoms of 3.59665 square metres each. The multiplication gives 5,754.64 square metres. The word came back from Latin; the number came from Vienna.

Romanian dictionaries, however, give a different value: DEX and DLRLC write 0.5775 hectares, or 5,775 square metres. That is not a rounding of 5,754.64 — the gap is some 20 square metres, and DLRLC pairs 5,775 with 1,600 fathoms, which would imply a different fathom from the Vienna one. The mismatch between dictionaries and cadastre stays, for now, unresolved.

And more important: 1,600 is an area, not a shape. A parcel of 80 by 20 fathoms, one of 160 by 10, or an irregular polygon can all have exactly the same area. The cadastre measured real boundaries — crooked parcels with numbers, roads, and streams — not a chessboard of 76-metre squares.

Nor did the hold have a single size. Local reckonings varied from place to place — 1,000, 1,100, 1,200 square fathoms — and the royal hold ran to 2,347. The cadastre fixed 1,600. The 1,200-fathom variant — about 4,316 square metres — is, for that variant, exactly three quarters of the cadastral hold.

South of the Carpathians the measure was called the pogon, and its size varied by period, region, and crop, around half a hectare. The Wallachian standard — 1,296 square fathoms, or 5,011.79 square metres — is only one of its forms; in Moldavian vineyards the reckoning was different. Another word. The same old idea: what the oxen can plough.

The metric system became law in Romania on 15 September 1864, under Cuza. Hungary legislated the metric system in 1874, compulsory from 1876. But the land books kept their old accounts: in Hungary, the cadastral hold stayed in the land registry until 1972. No mystery — institutional inertia. Old parcels stay recorded in their own measures.

The yoke was inherited. The iugăr was re-borrowed. The measure changed from region to region and century to century. The size of the iugăr did not survive two thousand years. The habit of turning work into land did.