BNR last reported such a high exchange rate on January 5, when the euro was traded for 4.2077 lei.

On Wednesday, the single European currency was worth 4.1492 lei.

The national currency opened session at 4.19 per euro but soon rose to 4.1760. It then started to lose ground and at 1:05 p.m. Romania's hour the euro stood at 4.1840 lei.

In the region, the Polish zloty depreciated from 4.08 to 4.12 per euro and then hiked to 4.07, while the Hungarian forint eased from 278 to 281 per euro and then recovered to 277.

For the U.S. dollar, BNR's exchange rate boosted 2.45 percent from the previous session, to 3.2759 lei per dollar. The central lender last posted such a high reference level on April 22 2009, when the dollar was traded for 3.2769 lei.

On the international market, the U.S. dollar advanced from 1.2830 to 1.2740 versus the euro, but then slipped to 1.2820.

Overnight interests on the monetary market increased slightly and stood close to the new key interest rate of 6.25 percent a year.

BNR posted an average interbank bid rate (ROBID) of 5.97 percent a year, up from 4.42 percent in the previous session, and an interbank offer rate for overnight deposits (ROBOR) of 6.47 percent, above the previous 4.92 percent.